HomeMy WebLinkAboutPacket, Pre PLANNER 6/4/2009
PRE-SUBMITTN
iJiSTRIB UTIOiVi'tIST:
4
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Date Distributed:
(0 - Lf--0'1
RECEIVED
/ Dave Puent - Building JUN 4 2009
v/ Gilbert GordonlMelissa Fechtel- Fire . . fu A Jlwj---
/ Jon Driscoll- Traffic By. . 1) ~
./ MattStouder-Public Works/Engineering. I O-P 5o~
Dennis Ernst/Chris Moorhead, Surveying
Planner, . cfbirL
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City of Springfield ,_
Development Services Department
225 Fifth Street
Springfield, OR 97477
541-725-3753 Phone
541-726-3689 Fax
Pre-Submittal Meeting
Case Number Assigned: PRE2009-00018
Date Submitted:
6/412009
Proiect Name:
Project Description:
Pre-submittal for Site Plan Review - Springfield Mill Race Ecosystem
Restoration Project
Application Type:
Job Address:
Site Plan Review
Assessor's & Tax Lot #:
303 S 5TH ST STE 140
1703350000307
DISCLAIMER: Applications will not be exempt from Development Code or procedural amendments that may occur
between the time of the Pre-Submittal Meeting and Submittal of the Application for Development Review. Please contact our
office at 541-726-3753 with any questions or concerns.
A Planner will be assigned the following business day and will contact you to confirm the meeting date and time.
PRE-SUBMIlTAl REC'D
JUN 4 2009"
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,
PlanJobPrint.rpt
I 6/4/2009
II :56:41 AIY
?re-Su"jmitta~ Y~eeting
Development Services Department',
Room 615/616
PRE-SUBMITTAL MEETING DATE: Friday, June 12,2009
1. PRE-SUBMITTAL MTG #PRE2009-000l8 (Site Tent) CITY OF SPFLD - PW
Assessor's Map: 17-03-35-00 TL 307
Address: 303 South 5th Street
Existing Use: Mill Pond
The applicant submitted plans construct Phased II of Springfield Mill Race Ecosystem
Restoration Project", Phase II is the conversion ofthe Booth-Kellx Mill Pond to a
diverse eco-system of wetlands, upland prairie, riparian forest, and:a meandering Mill
Race channel that will provide Upper WiIIamette Chinook salmon yvith direct access to
. the main stem ofthe WilIamette River. '
Meeting Dateffime: Friday, June 12,2009 10:00 -11:00 DSD616
Planner: Steve Hopkins . .
2. PRE-SUBMITTAL MTG #PRE2009-000l7 (Site Tent) AFIYA APTSIBRE.lDKEN
Assessor's Map: 17-03-35-41 TL 4600, 4700,4800,4900 HOU.SE
. Address: 1062, 1072 & 1082 Main Street. .
Existing Use: Residential, Church, Small Retail
The applicant submitted plans to construct a three-story, multi unit ~upportive housing
complex for persons with disabilities, The new building wiII provioe sixteen (16), 1-
bedroom units for low-come individuals which will include amenit!es of a multi-purpose
room, resident's game room, laundry, and management offices, ..
Meeting Dateffime: Friday, June 12,2009 11:00 - noon DSD 616
Planner: Molly Markarian
PRE~SURM'rrAl REC'D
n
!.JUN 4 2009
[City of Springfield
Development Services Department
225 Rfth Street
Springfield, OR 97477
Site Plan Review
Site Plan Review Pre-Submittal:
ISite Plan Review Submittal: 0
.. .
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Phone: 726'3685
Aoolicant Name: Leonard J. Goodwin
I Comoany: City of Springfield
IAddress: 125 Fifth Street, City Hall. Springfield, OR 97477
"_'-'''''''.''''',"".',,,.,.,,_,~,_., '_..',.,._,"" ,'n.' ...._ _,. _ ._. ..
IAoolicant's Reo.: TimBinl!ham
!companv: Lane Council of Govemments
IAddress: 859 WiIlamette Street, Suite 500~.,E~gene, OR 97401
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J Prooertv Owner: City of Springfield
Icompany: N/A
!~li,dr~s..~:".." .....11S.~ittllStreet, City Hall. Springfield. OR 97477
IASSESSOR'S MAP NO: 17033500
I Prooerty Address: 303 South 5rh Street
ISize of Prooerty: 116.66 Acres IXI
I Prooosed Name of Proiect: Springfield Mill Race Ecosystem Restoration Proiect
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Fax:
736'1021
Iphone:
[Fax:
I,
682..4410
682,2635
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IPhone:
IFax:
726'3685
736'1021
ITAX LOT NO(S}: 307
Square Feet 0
I Description of rf you are filling in this form by hand, please attach your proposal descrIptIon to this ~ppllcatlon,
Prooosal: See Attachment A.
IExistinQ Use: Mill Pond
INew Impervious Surface CoveraQe (IncludinQ Bldq. Gross Floor Area): 0
ISignatures: Please si nand rint your name and date in the a riate box on the next
. -
Associated Aoplications: SicJns: ,
Ipre-sub Case NO.:pre It.,oq - [ttJl~ I Date: to./ vii 011 Reyiewed bY:~ ntPL:.,
Icase No.: I Date: I Reviewed by::
IAPPlication Fee: $ JL{-(o0?- ITechnical Fee: $ -- Ipostaq~ Fee: $ - I
ITOTAL FEES: $ J~1.o ~ l PROJECT NUMBER: ii I
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PRE-SUBMITTAL REC'D
JUN 4 2009
Revised 1/1/08 Molly Markarian
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CITY OF SPRINGFIELD
VICINITY MAP
PRE2009-00018
303 S 5th
Street
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61
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PRE-SUBMITTAL RECID
JUN 4 2009
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ATTACHMENT "A"
Springfield Mill Race Ecosystem Restoration Project - Phase II
.. ,
Response to Checklist Submittal Requirements
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Narrative (Project Description)
The proposal represents Phase II of the two-phased "Springfjeld Mill Race ES0system
Restoration Project," which is a high priority project for the City of Springfield and the U.S.
Army Corps of Engineers, In addition to providing a more reliable and sustainable supply of
clean, cold water to the Mill Race for improving essential fish habitat for Upper Willamette
Chinook salmon and for supplying water to beneficiaries, such as farmers and! drinking water for
Springfield residents, the overalltwo~phased project will restore 2A3 miles and nearly 50 acres
of Mill Race riparian and wetlands habiiat. Phase 1 is located entirely outside:the city limits and
Urban Growth Boundary (UGB) of Springfield with construction scheduled to begin in
"
spring/summer 2009; Phase II is located mostly within the city limits - the m~st southerly 500
feet of tax lot 30Tis outside city limits - and entire(ywithin the UGE. Construction is expected
to begin as soon as permits are issued. . II
The primary focus of Phase II is' rhe conversion of the Booth-Kelly Mill Pond; approximately 45
acres in size, to a diverse eco-system of wetlands, upland prairie, riparian fore~t, and a
meandering Mill Race channel that will provide Upper Willamette,Chinook s~lmon with direct
access to the Main Stem of the Willamette River. Phase II restoration activities will occur
entirely within tax lot 307 which is owned by the City of Springfield. The fodowing are .the
major restoration and construction activities of Phase II: '
. Dewater Mill Pond; .1
. Remove and dispose of contaminated sediments;
. Remove, demolish, and dispose otthe Carpentry Shed, the Mill Pond Dan'! and bridge;
. Remove invasive species and replant with native species; .,.
. Excavate new Mill Race channel (0.9 miles/l.50 acres);
. Restore habitat: wetlands (11.20 acres), upland prairie (2 acres), riparian ~orestJ23 acres);
. Construct fire protection pond (0.50 acres) and two stormwater treatment ponds (2 acres); ,
o Construct pedestrian trails, boardwalks, overlook (4.8 'acres); "
. Provide parking by paving existing crane shed and install 3 bike racks.
The project will not result in any new structures, i~pervio'us surfaces, or employees.
i
In addition to the 45 acre Mill Pond and restoration area; other existing uses o'n tax lot 307
include a mix of manufacturing and professional offices to the west of the Mill Pond with
associated parking and utilities totaling approximately 16.50 acres. The remaining areas to the
. .
south and north are undeveloped (approximately 54.50 acres) and, at this time. there are no plans
for future expansion. Total size of tax lot 307 is 116 acres '
The proposal is consistent with the objectives of the Booth-Kelly Mixed UsesiUistrict, ie to
protect significant environmental resources, and with the City's Local Wetlana1nventory and.
Natural Resources Study that promotes restoration of the Mill Pond.
PRE-SUBMITIAL REC'D
JUN4 2009
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See Attachment B for a list of Figures.
Copy of Deed - City of Springfield is owner of tax lot 307.
Copy of a Preliminary Title Report - City of Springfield is owner of tax lot 307.
Copy of the Site Pla'n Reduced 'to 8.5"xll" - See AttachmentC.
Right-of-way Approach Permit Application - Not applicable: no frontage on ODOT facility
Three Copies of the Stormwater Management System Study - The proposal will not create
any new structures or other impervious surfaces and, therefore, no additional stormwater runoff
will be generated by this project. Twostormwater ponds will be constructed in the western
comer of the tax lot to provide some level of management for runoff from existing structures and
impervious surfaces on the western po~ion of the site. In tenns of how stormwater flows will be
affected by the overall project, the following is a brief narrative describing existing conditions
and expected changes.
Under existing conditions, the Mill Race drains local stormwater runoff as well as flows
originating from the inlet connection with the Middle Fork Willamette River. When the inlet
becomes hydrologically disconnected from the Middle Fork'during dry, summer months, water
flow is supplemented by'pumping. Several storm water outfalls drain directly to the Mill Race
ands to Jasper slough, which joins the Mill Race upstream of the 28th Street Bridge. Diversio~
pipes at Gorrie Creek and Quarry Creek divert flows from the Mill Race back to the Middle Fork
via hydraulic control structures.
Under proposed conditions, the inlet would be connected to the Middle Fork for a longer
duration than under existing conditions and, thereby, reducing pumping needs. A flow
constrictor and overflow weir will be constructed in the Mill Race Channel during Phase 1
limiting the flows diverted into the Mill Race under flood conditions exceeding a 2-year storm
event io the same flow as under existing,conditions.
The activitie's proposed as part of the Springfield Mill Race project include fill and removal of
sand, gravel, rock material, placement of large woody debris, and installation of concrete blocks
within FEMA Zone AE. The proposed activities also include excavation of material and
removal of an existing stormwater outfall within the FEMA Zone AE Floodway. No other fill or
encroachment activities are proposed with the Zone AE Floodway. The proposed activities
within the Zone AEFloodway do not result in an increase in floodway elevations.
The project does not affect the local stormwater drainage area discharging into the Mill Race.
As a result of the Mill Dam removal, a given discharge in the Mill Race would result in a water
surface elevation up to one foot lower than under existing condition in the area between 18th
Street ands Jasper Slough. An excavated channel is proposed within the Mill Pond area and
storm flows in this area would result in lower water surface elevations than under existing
conditions. The reduction in flood elevations is up to ten vertical feet in the vicinity of the dam.
\
An existing 48-inch storm',Vater outfall pipe along the north bank of the Mill Pond near the Mill
Dam would be retained under project conditions. The project will not affect the quality or
quantify of the stormwater effluent. On the south bank of the Mill Pond, existing stormwater
.. - I!
effluent would be routed through two new stormwater detention/treatment ponds. The ponds
will be vegetated to allow filtratic,Jn. Flashboard riser with'a large vertical ran'ge will allow
adaptive management of water levels and detention times to optimize pollutarlt settling. The
. '!
ponds are designed to improve water quality and attenuate peak flows during ,storm events.
For more information pertaining to the hydrologic and hydraulic analysis conducted for the "pre"
and "post-project" conditions for this project, refer to Attachment D. . (
Three Copies of the Traffic Impact Study - Not applicable: the proposal is'a habitat
restoration project and, therefore, does not result in'the construction of any ndw structures or the
conversion of existing uses that would generate traffic demand. .
Seven Copies of the Following Plan Sets for Pre-Submittai OR Eighteen Copies of the
Following Plan Sets for Submittal
a. Site Assessment of Existing Conditions:
. Vicinity Map - See Figure I (includes watercourses). Note: applicable Water Quality
Limited Watercourses and setbacks are: Mill Race (setback = 50 feet) and Mill Pond
(setback = 50 feet). See Figures 2 (Springfield Local Wetland Inventory), 4 (soils), 5 &
llC (aerial photo showing what is remaining arid what will beremo~ed). . .
. Floodplain/floodway boundaries - See Figure 3. As shown, there are no flood hazard
zones affecting the Mill Pond. " .
. Time of Travel Zones - The most northerly portion of the Mill Pond is affected by a
. 99-year time of travel zone related to. a wellhead located near 1-105 imd 9th Street. No.
other travel zones affect the Mill Pond area. ' ;
\.'
b. Site Plan - See Figure 5 where 2008 aerial photo shows the existing Mill Pond,
surrounding undeveloped areas, and the existing buildings and other related development
uses in the western portion of the site. - j! <. .
. Buildings - See Figure 5 for existing structures. No new structure~' are proposed
. Fences, walls, storage, equipment, trash receptacles, signs: Within;,these categories of
uses, trail signs are proposed to be located along the proposed ped6strian trails and
baardwalkas shown on Figure 5. ii
. .
· Parking spaces: As shown on Figure 5, the.floor oftheexisting Crane Shed will be
paved and striped in accordance with City off-street parking standards including the
provision of one disabled parking space. The existing Crane Shed"building will
remain in its current location and, condition; the only proposed chah'ge is paving and
striping of the Crane Shed floor. . ,
· Development Area: No new structures or impervious surface areas are proposed.
. New trails and boardwalks are proposed as shown on Figure 5 but :Will be constructed
with perviou's materials. These pervious areas represent a very sm~ll percentage of
the project and are less than one-tenth of one percent of the lot area.
. '. .Solar Access: No new structures are proposed.
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. Loading, vehicular, pedestrian circulation. Figure 5 shows the proposed parking area
(Crane Shed) thatwill rely on the existing circulation already provided to the
structure. No loading areas are proposed. . See Figure 5 for location of proposed
trails, boardwalks, and overlooks~
.' Figure 5 shows the various streets and, rights-of-way that border tax lot 307.
Frontages along each street are: South B Street = 960'; Quarry Street = 1,255'; Hill
Street = 970'; South F Street = 47'; Railroad Tracks = 2,533'. None oftheexisting
streets have curbs arid gutters and, therefore, no new curb cuts are proposed and no
existing curb cuts are proposed for closure.
. Bicycle parking spaces -;- 3 spaces will be provided within the Crane Shed parking
structure as required by City development code. These spaces will be designed,
located, and constructed in accordance with Section 4.6-145 through 4.6-150 of
Springfield's development code.
. Existing and proposed transit facilities - None.
. Open Spaces, recreational areas, and other public uses. The.overall Mill Pond area is
approximately 45 acres in size and all of it is considered public open space with some
recreational uses in the form of trails, boardwalks, and overlooks.
. Phased Development - there are no current plans for developing future uses and
ph[ises on tax lot 307.
c. Improvement and Public Utilities Plan .
. Existing/proposed easements: Given the nature of this project and the City's
ownership of the tax lot, no easements are proposed. There may be existing
easements associated with existing utility lines and poles.
. Existing streets, alleys: There are no alleys. Approximate street right_of-way and
paving widths:
>South B Street: 50'/25
>Quarry Street: 40'11 0'
>Hill Street: 40'/0'
>South p Street:. 0'120'
. Street Lighting: None.
. Traffic control, fire hydrants, power poles, etc. No traffic control or fire hydrants are
located on-site; however, there appears to be fire hydrants located offcsite and along
South B Street and South 7th Street - refer to Figure lIB. As shown on Figure 11A,
two 115 kilovolt electrical transmission corridors cross tax lot 307. One is located at
the west end of the Mill Pond where the pond tapers down to a channel and runs in a
north-south direction containiflg three, lines and six power poles. The second corridor
is located along the southerly boundary of tax lot 307 and runs in an east-west
directionJor almost the entire width of the lot where it then turns and aligns in a
north-south direction along the east portion of the lot and crosses over the Mill Race
and continues n~rthward. The power poles are located outside the footprint of the
restoration project .
. Existing/proposed utilities. No proposed utilities. See Figure lIB for water mains.
Public water mains are generally available to the site at South B Street and South 7th
Street, and on Quarry Street east of South Sixth Street. See Figure II C for sanitary
sewer'and stormwater facilities. Sanitary sewer and storm pipes are generally located
in the northwest corner of tax lot 307. The only pipe that appears to encroach into the
I:
project footprint is a stormwater pipe in the general vicinity ofthet:Mill Pond Dam.
All other facilities on this figure appear to be either mariholes, catSh basins or outfalls
(stormwater) and these are concentrated in the most western porti~n of tax lot 307
were there is existing. development and uses. :
d. Grading, Paving, Stormwater Plan i
,
. See Figure 7 for Fill/Removal within Wetlands I~
. See Figure 8 for Channel Profiles ,.
. See Figures 9A and 9B for Grading Cross-sections
. See Figure 9C for Typical Cross-sections .
,
. Roof Drainage Patterns: No new structures proposed. See Figure 1'.oA for topographic
and drainage patterns. . . . I:
. Impervious/Pervious Drainage Areas: All existing structuresistredts/parking shown
on Figure 5 are impervious. The proposed activities/uses are all pe:fvious.
. Amount of earthwork: Fill = 6,556 cubic yards; Cut = 69,622 cubic yards
, II
. See Attachment D for description of drainage conditions pre and P?st-project.
e.' Landscape Plan I
.. See Figure 6 and Attachment E for Planting Plan Table.
f. Architectural Plans - No,structures'proposed
g. On-Site Light Plan - No proposed outside lighting.
h. Additional Materials Required - None.
Additional Standards/Applications ..
. .. Riparian Protection ~ The Mill Pond and Mill Race have 50 foot ri~arian protections.
For the Mill Pond, the top of Bank is shown on Figure 5 and is generally located one
foot above the ordinary high water line around the perimeter of thi Mill Pond. The
extent of riparian restoration landward from the existing top ofbarik is about 75 feet
on the south bank. Along the north bank, the limit of restoration iJ approximately the'
. II
location of the existing top of bank. The future top of bank along the north side will
be located considerably further south than its current location providing a significant
. .
riparian buffer from the new channel and proposed wetlands. The!buffer width will
narrow back down at the'west end of the pond as the new channel ~lignswith the
location of the cun'ent channel. The proposed restoration project ~ill result in the
protection of and a higher functioning ecosystem than under curre4t Mill Pond
conditions. . ~; .
,.
. 27 trees will be removed in the most westerly and easterly portions of the Mill
Pond/Mill Race. A Tree Felling permit will be submitted upon cOfupletion of the pre-
submittal meeting. Ii
. . Wetland identification has been submitted to DSL as part of the MIll Race General
Authorization permit. . It
. A JointApplication Pennit for General Authorization for Fish andliWetlands Habitat
Enhancement has been submitted to DSL and the U.S. Army Corps of Engineers.
"
. An LDAP application will be submitted upon approval of the Site PlanXeview
request. . . ji
. Annexation of the southerly portion of tax lot 307 will likely occm: if and when that
area develops. !i
II
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Figure 1, Location Map (Phases 1 & 1f)
Figure 2, Wetlands Study Area Map (Phases 1 & 11)
Figure 3, Flood Zone Study Area Map (Phases 1 & 11)
Figure 4, Soils Study Area Map (Phases 1 & 11)
FigUre 5, Site Plan Review (Phase 11)
Figure 6, Planting Plans Typical Sections Stations: 1 08 ~ 155'
Figure 7, Fill/Removal in Wetland Areas
Figure 8, Channel Profiles Stations: 145+00 to 105+00
Figure 9A, Grading Cross-Sections Stations: 155+00 to 131+00 I
Figure9B, Grading Cross-Sections Stations: 130+00 to 106+00 :
FigUre 9C, Typical Cross-Sections Stations: 155+00 to 144+00; 143+00 to 138-+100; 138+00 to
131+00; 131+00 to 119+00; 119+00 to 108+00 II .
FigUre lOA Erosion Control West Portion oj Mill Pond I: .
FigUre lOB Erosion Control East Portion.oj Mill Pond i~
"
Figure 11A, Existing Electrical Facilities '
FigUre 11 B, Existing Water Facilities .
Figure 11 C, Existing Sanitary Sewer and Stormwate~ Facilities
ATTACHMENT B
LIST OF FIGURES I!
FOR SPRINGFIELD MILL RACE RESTORATION PROJE(!;T - PHASE II
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Figure 1. Location Map - Phases I & II
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Springfield Millrace Location Map
Phases I and II
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Figure 2. Wetlands Study Area Map - Phases I & II
Springfield Mill Race
Wetlands -- Springfield Local Wetland Inventory
National Wetland Inventory in portions of Lane County
Wetlands Determination in Phase I and Phase II Areas
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FigUl 3.
S ringfield Mill Race I .
F~MA Floodway, 100 yr Floodplain, 500 yr Floodp am
Legend
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[ j Springfield Urban Growth Boundary
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Figure 4. Soils Study Area Map
Springfield Mill Race Restoration Project
Legend
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~j:~, I 1t.G . ::~~'~ ~ /-~- ~ 110 W 96 ~ 'V V ~l · ,_96 ~
'- \. .' --' w~ 95 ''''A'"'~ .. [
~ ~
l>
...
CD
~ III
~ .> ~
L --- " '>..~!i. 26 ~ 1 8F 9C ./" JL:": w.g
. ... 3Ib- "--^-
o 5001,000
2,000
I Feet
N
A
Figure 5. Mill Porlu Restoration Site Plan
IJ....
'. ,.,...,~,. .
. ,~,,'
'".
. ,
Legend Data Source: Tetra Tech, Inc.
Proposed Restoration Planting
~ Ash Forested Wetland
~
~
C
Scru~hrub
E , , ~. "' ~1It Wetland
Emergent Wetlandl
Seasonal Pond
~
~
Upland Prairie
large Woody Debris
Top of Bank
Project Elements
~ StormwaterTr~,:...~..: Ponds
--/""-.. Trail
",,--- Boardwalk
..------.
, .
. ,
~--_..--
Proposed Parking
Trail Signs
N
A
c
o
300 600
I Feel
2
Figure 6
Planting Plan - Typical
(0 STA 138+00 TO 139...00
(3) STA 139+00 TO 143-+00
G) STA 142+00 TO 143+00
o STA 138+00 TO 142.. 00
.-. AEMOVECtwlNEl__ T
CONSTRICTION I
AND Af\ot:GETATE .
--ACC-TO-flANTING-f'lAN- --- ;:;.~ .
3. 0/----:
1- . r
L.:NO ~- 1 ---
r--- WITHIN LOW FlC1N CHANNEL
. I . I .
490
480
470
460
490
480
470
Sections
o
490
480
470
460
450
-75
-0-
3
.,Ot!!' -!-
"r 470
t 460
, .- 450
o -25
(NTSI!E\
~
..- -::j
\
460 . '-- =1PlAN1 UPlAND P1WRJEL::,- -'-
: ~ AND RIPARIAN 'vEG .-
450 .: . . . . I ~0.0tf!', "."
-75
,
_~t_.__~_
I
. I ,
. i
450
-75
-50
-25
o
-15 -50
INrs 1(D\
~
TYPICAL BENCH
STA 144+00 ro
F ILL SECT ION
1 S5+00
rYPICAL TRANSITION SEcrlON
STA 138+00 TO 143+00
c
450 -.
-150
-100
-50
o
50
Q)
TYPICAL BERMEO SEcrlON
STA 131+00 TO 138+00
(NrSI
RIPARIAN PLANTJNGS
TO PROJECT UMIT
K I
-50
-25
--1 TO PROJECT UMIT
490
100
SEEDING ONlY'WIlHIN SEASONAL PONDS
--.J AIPAAIAN L SHAUB _ J
I PlANTlNGS I WETLAND ~
--- - -- ., -
AIPAflIAN PLANTINGS'
TO PRO..ECT UMIT
~~D~
490
490
480
470
460
j-
. '- - .-- -- -- --, - - ~ - - - . - - -
~-;- __ _ --! _ _ __ _ _ -.L __ ~ __ _ _ _ _ _ ___
-'-- - ~..~,,(~- - - - - - - - - - - :-d:J.J;-
I :
NO PlANTlNGS .
~ ::~r: ~Na ~ =ai:
~---J..~~:
."'W~-f
B
450 '.
-250
-200
-150
-100
TYPICAL POND SEcrlON (NTSI
srA 119+00 TO 131+00
~
-50
o
TO PROJECT UMIT
RIPARIAN Pl..AN11NGS ....J'--1
490
TO PROJECT UMfT
~ RIPAAlAN PlANTlNGS -l SHRUS WETlAND PlANTlNGS ~ ~ SHALJa WETLAND PLANTlNGS ~
;::~.~~-t:,~ =.~t~= '= _~!!f.1
460 AND REVEGETATE 1>CC .
I .TO f'\ANll~ PlAN . .
450 -.
-150
-50
o
-100_
A
TYPICAL CHANNEL SECTION
STA 108+00 10 119+00
CD
(NTS I
NOTE.
PlANT RIPARIAN BENCH ALONG CHANNEL WrTl-I WIllOW R..ANTINGS
PLANTING ZONES SHOWN ON SHEETS L-l A"'ID l-2
,
I DATE .we TIIolE PLOTTED: 111'/288"1
11.21008 ,,'"
50
100
450
150
50
460
450
150
4
490
480
Emergent W'U.nd~2rL'ff~"
~;;-M.....
,III..'" ,
~ '....il
T_CI"m"'r-~.."..
III ~ I1Il.<<fucrlll.l
I ~
It"I""'~~"""~
!a11.rt~'a
480
470
460
Scrub-5hrub WeUllndJAlnua rutlrll
Comi.la-w:.1I .
IFrllnxi......11Il1tolla
IPhVJJflAlaUDilatua
ISl:r{IlJ~&
ISl:b..ld'lllnala
ISpifMdouglNiI
TO PROJECT UMfT
~ RIPARIAN PLANTlNGS ~ SHRLIe WETlAND PlANTINGS ~ ~ SHRUB WETlAND PLANTlNGS ~ RIPARIAN Pl.Hl1lNGS
:::~wif"~-~_J~~~.,~,-,J~-
460'-- _______ - -- _L___.__ 't;_ ___..1,__ -- ------
I
Ath For..ted WellilndlCIIIllI ob'JV"P
lCOm.... dAd',
IFrJlJliflull ',bfo~.
If>hn'YZ7ll.);'J{1~'''u,
,s~~~....
COmmon Ceme$
~tmt-
son-Slern8uIful!,", lute
';WI<<".
rtar
SiI.......1lOw
.....-
~il!"
~u;;.
:>adficwillow
$IIk.lI.,.;\IOW
'JougIes"p'I'O!.
tP-
"""'""'"
Upllind PrllWie faE ml~mL. v.... OIXlde~We&lem YIItrOW
,I I~'.C:; b:r.:
';:.. IImOenol Fef1lwelltoapnn(!
I~~ ~~=rs
~l::::::!"'~
1l:V;Z;;;IlOW_ M$~ ,,oe1Ce1l
.~~~..
480
470
460
450
R~nlAcercirdo\elum
;;;":::&ll.~
~eIoeedrusdewrf1l""
~""nuhM"
~'C::.
IPoIys~ct1oummuovtum
ii;l~~"
rs;klfiltJ
ISll~ISlIdIensI'
I~..,..A~_~"_
.....,~ j
G.:;r- 'b. (",\,;,;,~l
rJ :111. ,.. I
"'M "...
'Om "'M ~I~
G".. :::Ill ''"'
",m 21bs ,
'~I .... ,.. ,
'am P'~ ''''' I
"am ~ '''''
G~. "'"
G~. 10lbs ,
,am .... ~I
G_. ;1.g
,,",U '" I
;)hrub ~' .
'''"'' ... ,
r_ ~ ,
"""' ,
"""' ""'''' 6
1'_ ~' ..
"""' , , '"
IT,.II , I ..
'''"'' ""
1'_ ~ '"
'''"'' ."
~'~ ''''
~ ~, "'"
'"
,- '"
"""' '"
"'"" '"
'am .... "...
""" .... 'o.
'am .... ,o.
'am .... "...
31M. .... 10lbs
GrllU .... ,o.
,am ~f "'"
'am "'"
'am ". "'"
~~ I;:':~ ';:' I
~S.,., f.':' ~~ll ---w-i
~KJfieJrlW11J T.... 1 2tJ I
::.I~W'fhuI Tree 1 ..~ I
N,.ameIleVajlevt>anderosaDine IT.... 'I lO-------.J
Swon;l"- ~"otm.n 500-'
~:-t -- -l~~~ - ~~ 2:
"".~;lrlr'- '''ru' r) I ,,,-
~(.=tU I::: ~ 1~
I=::: ,~:: '-;'df~ ~~
PLANTING TABLE
480
470
NOTE:
PlANT SO THAT TOP OF
ROOT BAlL IS EVEN lMTH
THE FINISHED GRADE.
SCARIFY SlOES OF PlANTING
PITS PRIOR TO BACKFllUNG.
3.
MULCH.
KEEP
MUlCH
AWAY
F1l()t.I
""NK.
.- FORM
SAUCEA
v.m<
3"HIGH
CQNTlNUDUS
RIM,
2 TIMES
BALl OIA
DECIDUOUS TREE AND SHRUB
PL.NmNG DETAIL
PLANTING DETAILS
I BY USERNAME' KREV.PRICE (~TITLEO 'IIQR1(SPACE,
GD
(1)
""'- 36- LONG lIVE STAKES
~.-1. CIA. WITH 2
LATEAAL BUDS p.a(y\/[
GRADE
PRFLlMINARV O~eo)l NOT FOR CONSmUCTION
I SI€[T HMIE; 26 L3 PLAHTlNO TABLE AHO DETAILS
-
.'
fF.iOf.ll
~
US A/rIfr COtpl
oIE"g.......
..............
...
!
~
I
~
I
~
..
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I! ill!!
in, ~~ J l
, '8~! ~
, ~, hJ j
i 'I i ~ 5
..!~ = 1= it !;!
'Ii ~_
~
~!.i~ ~
~i~ /
IH I
,
.
;;
~
~
I'l
~
.
~
~
;'
c
~
~
~
;
~
u
~
~
,
"
~
4~~
t" g
i~~1
"~ :!
.
..ii
=
~ I
d~H li~
ii1f ~~~
! J~ ~~
I
SHEET
;;.
J
"
L-3
~
I'l
_"<>IN
Figure 7, FiII/Ren /al in Wetland Areas
Springfield Mill Race Phase II
Legend Data Source: Tetra Tech, Inc.
...c:::!.,~ Fill in Wetland Area
_ Removal in Weiland Area
Restoration Boundary
"-.J Springfield Local Wetland Inventory
r- FEMA Floodplain (See Fig. 3)
o
N
A
300
600
I Feet
2
3
4
Figure 8 Channel Profiles
mJ
us Army Corpt
01 En,......'
.........-
.
I
o
EXISTING TIMBER BRIDGE E DEMO, HAUL, AND DISPOSE
AND BUILDING EXIST DAM. BRIDGE, FISH
:~~: -=~_~~~~~-~Y~~A~~ n ~ = _I_ .-_ =- ~STA1M.~N~_~~~~I~E~-.' ~..- .-. ere. . _c C i-~,.:?:;:'.~iOi'" . _.l - =-.. - =- .. . -- -~ :::
466----- ---1- ---,,-----+--- MATCH'" ----.- - - - IT-- 'l.=N-- - ,- ------1---- _n ---.----. - ----- 466
464- -~- - --- -- -y--~\-- -niAlweG-- --1- _-u - .i_ \r - ,------ - --- - ~~~/r~c-=-.cc--- 464
462 _: - - -- -- -- ----; - - -- - -- + h - a_454.l1O'__ - -- -~ -- - - - -- -/ - --= : : _ I ~: - ---=.=+- - - =- ::-u.:-: - - -~ -=- -_- 446602
460~- I 1-- --PlACEl3RAVEl"FILL-
458 - - - -.- - -1- - n -- -. -- -40 CHANNElINYEAT~ -- -, -- - + -- - - -- -- ; - -- --- - - --4- - -- -- -- -- -- -- -- - -- --- -- - - - - -, 458
456 - 1 -.::_:::__~ '" -1 -- -- --, - -',.,.00023- -- -. -- --- - -- - - n_ ---t 456
m :- ~~om;;'~C~~ DEl BC-15~ -- 1 ~~_::>r - --- - -- -- - --- -- - -- -:1- - -- -- --- --- - - - --:l ~~~
450. ;." i . . . ',.450
105+00 106+00 107+00 108+00 109+00 110+00 111+00 112+00 113+00 114+00 115+00
i
I
c
m ~=:: ==:.:: - : ~ ~ - == :-: ~~ -= ~ ::- ~--
464 j---- ----~---- -~-
462 - - - - - - .-, .-. - - -- - --- - -- 0-
460 - - - - -- -- , -
458 - ~ - -- -- n' -i-
456 - '- -
454 - ~ -- -.- -- -1 -
452 - ~ - - - - -j -
450 . .. I
115+00 116+00
:: _ r::- =-
-- --- --j
-~~~ ~o~;~= -.= -
_ -SJu.a_A59.B'n ---.l _ _ ___
-- ,
-- - U J -- -- -- - - - - -- - - - - -- - -T 470
--- --- - -,----------- -- A"'+4Il ;r468
-- ,- _ _ -- -- --1. _ .-_ - - -- -- _h -- -- -- -- - -- -~TRUCT~ 466
L_ . __ ~:~ 'l'ON1YTlNltT- 464
.:: -+- =- -=:::::::. :: ::: -_ =1::::: - - ::: ::: :~- _-= -= ::::. =- -_:: =- _ ~T~H EG = m
__--1___.___ ___________.1_._0.0023---------- I 458
- -J- --- -- - -- -- - - - n .- --- --, - - - - --- -- ,- - - - - '456
__ _,_ __ _ ~ - -- ~ -- - - - - - -, 454
-- -1--~ - -. - -- ,- - - - -, - -- - -- - . - ~: m
122+00 123+00 12'4+00 125+00
- -- r--'
-- - - T: =~
__ _.I
-- 1---- - 1-
.:: - r:- :::: - -= ~ ...J-- --
---- .~------~--
I
,
-, -- - ---
117+00
118+00
119+00
120+00
121+00
I
~ ......
- -------t-
I
,
_~ __ 1-- _ _ _
;
,
--- -- ~~--
;
470 -""""-'1'\'''' - - --- T - - - -~ ---1- -- -- - -, -- - - - - I - - TH' - i- -- _ -- _ _1__ __ _ __ _ _~., J~)ISll':'~~~'i:'B:~OG~_ - - ----
468-'<.Ul<shluCl-- --~- -----._---- -------------'--.---- --. CQNSTf1UCT ' - ---~-------- - ~'"".,t(f ----------
466- ~H3,'~LET----I- -------r--.-~---'--=- ,---- ---=-+__.S,~.~:...1:1JL~--- ==~----n-~I""""'G-.---- ---- ---
m: - - ---~=--1== =:---~=====~====j=-= ===~==r'- =- _C ___-:~_:~O~~==~-~~~~- = -======
458 - -- -- -- -1-.- - - ---+- - - - ---- f- -- - - - -J- -- - - - -j- --.--- -- t- - -~~~ DETBC-15~-j- - --- __L n_ - ----
m : ;- = = == = :::] .::- ::: ::: -= = I =:::: ---: = = r:: = = = = :::] = :- == = = I = = = = =: C =::: = = ~ = =::-.: ::::::: I = = = = = ~- = = = = =
452 - ~ -- - -- -- ---j - - - - - - T - - - - - 1- - - - -1- - -- - - -r - - - - -- , - - - -1- - - -- -1- - - - - i- -- - - - -
450 ~ - - - I .. I I . . .. ".... ... t . . . . I "',"":' '. . . . 450
135+00 136+00 137+00 138+00 139+00 140+00 1'41+00 142+00 143+00 144+00 1'45+00
470
468
466
464
462
460
458
456
454
452
-, ii
! d.
,~i i!! .
!. il ~ g, ~
~ ~
~ !II ~
, !.!.' h l j
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I. i. iiEd ~
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r il t".~
i n i;~I
.
.
-;
z
8
B
~1:>R.M _
470 ~:- - - - -- ~~~~ t-'UNtn? 00llET- r - -., - r - - _CON~IHUCI PUND3 OUILET_ - -f - - -- -- - - - ~- - - -- ---
468 . ~ -- -- -- -- SIll--cEl---46t.3'. - - - --l--- __ __ _ __ __ '_ -- -- - ~1L1. EL-462~~ - -- - -- ~ - ~ ~. - - - ~~;H~- -- ~ ~ --
m : ;-- = ~_- -= = =~:::: = = =- 1: =__ - _ =_ C -=:.:: .. : = ::J ::- -=_ =. =_ = .:;: == .:= :::. ::...: ==~~'w1NLET -:-- ---I - - ~
m : ,- =:. ::..: -= ~::-; = - = =::: t :--- ::- ~~ ::-::.: :.:: :::~~ =-~ :::~ - ~ - -= -= 1::- _-= =: == :::.: .= ~~ ~ - m ~~ _._o~ ---- -
m: = _ _ =:::::J =_ -= =- -= 'T: -= =- -- =c =_ l=-- = = =:::::J ::::: == -= -:: J:::-::' -= -__:: :-:::: -= =::: --=1:::: -= :.: ~
452 - - - - -- -1 - - - .- -'- -- .n _ 1-- -- -- - - - --j n' - - -- -, - -- --- ,- -.- -- - -- -< -- -
450 ' ' .' . . . , . .
,
125+00 126+00 127+00
_____-===___n_ ---~=-::~m
- -.- --- -- - - -- -- - -- - - - - 466
- --- :-=-=-=-=- -- - 464
- -- -- -- - -- --' . 462
. 460
-- _1.._ -- -- -- -- -- - - - --. --. 458
__ __ - __ - - -- -- -- - - n - ~. 456
-- :t :.:: ~ :~ -= -= -- - ::: =-=l m
133+00 134+00 135+00
128+00
129+00
130+00
131 +00
132+00
CHANNEL PROFILE
PCL
@
'0
o
'0
20
~ I ~
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~
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~
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SCALE
-
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I
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IN FEET ISV:1H EX)
SHEET ::;
~
C-6
~
i!l
I OATE .IrHO TIM[ PlOTTED: U15/28rI
Iltl0.2Q AM
I BY USERNAWEI KREY.PRICE l'-"'TITLED WORKSPACEl
PRFllMINARY nF~IGN NOT FOR CONR.TRUCTION _ -. u .. Jfo
I SHEET N......") 13 C6 MILL PON:l PRCf"ILE
D
I 2 3 ..
'Figure 9A Grau{ng Cross Sections
4901;;-I- - -- ---~ '1-1- 490 -, ---'--J-'--~-I- . 490 J ,--~ --- 449805-~ J- .]"_-J_--'--, -._1-_ 490'-'-~---T -'--'-'1-,-.490
4851;;- _ldJ__. _L_ -- -- 485 --i _1_-1--- _1____ 485- ==--1-_1 _l-="~~-- L - 485 _-...;__1 ____ -1-- -V- 485
480, -- j -I + - --- j -- -, - -,- - 480 - -i -1-- j'- -; - ,- -.- : - 480- \t -,- 4_ -] -- - / ~-- 448705 c- --j ~. - ".._- _-_. j _- '--L --;-_ -f--_ 480 ~- I -'1-- 1 --i .-]'- .---.LI- 480
475o~ __.1 ____L 1.__1._ 475 _...L___ --'-. -- -- 475 --~-- _.1.._ -~.--/---- - - - 475---'---- _" _L/_'_'__ 475
470' o~-I--I ~-- -j- --1 ~I- 470-i.=! .--+ -I--j- -,-=1== 470 ==-1 ~~ --j ..,..1/ _, =_1:-.:: 470 ~':--t. -'---j-- I--_-=-f - 470 ;=-t=I'-'"-t-. -j;. -j -f- 470
~~6 ~-= + -I, -j-- t- -+ -,= ~~6 C0~ -~+---; '- t- ~ -1-- ~~6 - -+ -I--r---T - ~ - ~ -1- ~~6 ~~:-j :-:- '::-l---=-l~= 1= -~ =- i:'" ~~6 ~ ' =/= + ~-::: 1=- -+ =1-- m
455}-T-I'-l---C"-[-- 455 ---'-1 r-1-C'-I'-. 455 ==-=rr'::j-_I.::-::r=I- 455"-J- J-~-C-'-- 455'-T--I-~ '-'''-1-.455
450 ;~ -1- --. - ~- - --L - 450 - 1 - - -- - ~ -- . 450 -;. 1-- - 450- - - - ...J - - -, - 450 ,-- -+ -. - _.j _. _ 1--- -4 - - 450
~~6 "'I,,!, iII!II'0''''W~!W~.w 1--- ~~6 - T -1- t" ~14J!JJ I'!-- 1- - ~~6 - ~ ,1;1,-;-; ;1''-;'~I~!UJ ": 1111 !-", ~~6. ~'Ilti III 1""1,, "~~m6'J '\' ;0;-1- ~~6. :'I'1II"!;O-"~,, ";vI~ 'O!';O;- ~ ~n
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100
:i~: I =rc J ~::: C :r =c :i~ : jJ~ r:J CT C,~ ,,: 1i~ ~,~ Fe ~C L:1::: ,: ~r:::c m:c cr ~ - ft"'" ..1 :::[ . m-, = ::[C r::J = [:J:::C 1i~
480-+-1- :t-7f-. COMMONI-- 480 '--1 -j---'---'--+-j ~I- 480 ~--i -1"- -1--'-//'1'-. 480 ~.~. l -1- -j -I'~~~-!-- 480 ~+-I-:t-j-t::-+-I--. 480
475 _.J._ _._~ElCCAVATION_ 475 -.- -' _L~__L --- 475 ,~___J...____L_.____ 475 __ -~ -- _1-._ -/- . 475c::!::-- ~__ ___.1_1__, 475
470 r-I t -~ err 1 470 -1-11 I 1- 1 I 470 ===r=I'" 1-/ .J./! -1- 470~ T- J_ -I J:.c='-'"'- 470-t~-: -, 1-- l~ 470
1!5 T- 1,""'- ~ r -I -T 1il @f-=-, '"' , T ~ ! 1!1;: re:, :~'r:-;: ~; =ere 1ilt ,T -,- 1 i-r ~ ~- 1!5'~:j -=-,= 1 =~ = , 1 ::~ 1~i
455 - 'T -1'-- T --, - '. ,. -,-. 455 -1' ,- T -1-' -I' --I. . 455 :-, --,--. r' -,- 1-1- 455- -, -1-- T ----, -, =r -,- 455 ~ '--1- ,- ----, --~, -1- 455
450 - -I - -- L _1. - t- 450 - -, -.1 ..- - -- L - 450 ~ -I - --, 1- --- 450 . . - - , 1- - - 450 -__ _, __ - I _., - I. ~ 450
445 --;T;--I--~ --r--+-I- 445 ----r-:-I-r-j-t--r-;'- 445.--:-t:--t-; -1-,--r-l- 445 -,-I -1-"+--4-,iI;--'->- 445 -:-t--I---;-;l -1',-- --- 445
440 11:1111:1111:llllil~~t6dll~IIII.111 .-440 111:1111:lllli~~tdd'I;IIII; 440, :1111111111111;llllf~~tddll;llll: 440 :llllllllllll.u;-'4J+U'JIIJIIII;111 440..~III:1111 1111!14bl~!u'JIIIIIII~1 440
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100
m -= r =1- I :::.:, =.l-- =r =-c m:::.::~ =c r::J = 1=':::':::': [=. m'::::J::':: = L:"] -= r.:: =r =c. m ~.~T::':: -!=~.:: L. -- = =- m -= T =1::.:::;- =- --= L --l :"::C. m
480--~-'--i ---;--+-1- -480--j-'--I--I-~-'-!-_.480---j-I-t._ju--i=-'--I= 480] -J - ,- /" 480~-::t-I--J---t--'-!- 480
475 __-1.._.1 - - _,_...l__. 475 ._...L_I_ _~_L_ -'- 475 --=-"" ._J_/__L___ 475 ~- =-,-=~=-';-=L_ =.=;_. 475~-,,_-_u- __ _L_~ -_ 475
470 - -I- -1- r ---; --,-j - 1- 470 - -t -1- +- -1- t- -f- -, 470 - -t- -j-,\- --, - 1- ,- i- 470 _- -f -_..........._ _ -t- - 1--=-_ I- - __M -_ 470 ~- -t - i_ - ,---=.=-.l= 470
465 - - 465 - . , - 465 -- - - - -'--- .,L --- - - --- 465 -- 465 c_ - - ---~-=- - - - 465
460 - -I- -1- -j- --,- r- -+ -1- 460 - + -1- +- -, - 1-- -; ~ 1-- 460 - -+ -1- t- -..:t- j- --j --1- . 460 -- -+ --1- +- --1- t-- -.\- - - 460 ~- -+- -1- ~'-l - i- -j -1- 460
~~6=I=I=--=J-==:J=r:::=r:=C ~~6 =I='-=:1=:J=c:::r-r ~~6=-=r~= = L=~=C:::r=C=- ~~6 ~ J== :::':J=:::.:J=r=r== ~~6 ~= i =c =~==L--L=~_ m
~~6 ;-;l - t:-: -;i- - - ~~6 _."~ '-'-;-!',,, ;10, ~'J&!2J'0';-'; r -. ~~6-;i o'liii" 1t-''-I;mUJ~~ 1- ~~6- -to III! ~ "1,, "\~~~~J Ii:, II ,- ~~6 :-,,~ I"-!;o. ':" "~'~;-~JJ "T,;O;-!"" ~n
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100
490 I-I-r,-r-"-I-' 490 --T- -'--I-'-T-I--- 490 -'-I-I-] '-1 -,-- 490 --l -- - , -1 -,- 490-_--~ - - ---r- r--- 490
485 - -- -; - i- -+ - _. 485 -- - -1-- -I- --J - 4-- _.- - ._. 485 - ~ - ---- - - - ~ -1- 485 -+ - - -: - - - ,- -- ,- 485". -L -1--- --: - _, __ L-_ - 485
480 .-_::t _' 1-_ 1: -:..--: t::::! -_1_- _ 480 --::t -1- -t- --1- r- -, _or . 480-::t -I - T -, - ~- -r --r- 480.-::t -! - U +- -J - t:: ~ - ,-- 480 ~~::t -1- -,- -! - C' .+ - i- - 480
475 ~ - 475 - - - ,L _..1 - L. -~ - --. 475 - - - - -' -'-- --L/-__ 475- -. - ~- - - - -/- 475 __ _ _ _L - -- ~ - - - 475
470 -+-I-+---j-t--t-f- 470 -+-1-+---1-1-,-1-- 470 --r=i"'+---j-,-/t-f-- 470 -I -L-i-I--/-r- 470 'i-:. '-.:L-_1..=-J:--=-=--r-- 470
465 - --- - 465 ' , - 465 ----~------_.- 465 -=---~-------=--- 465----.--.-----.-- 465
460 -+-1-,-----,-+-1-- 460 -+-I--t--~-j- -~-~- 460 --+ -1-+-'-1--+--1.- 460 -+-I--+-=-.j--i--, -i- - 460 ~-+-I--j-~-l---~ -1- 460
~~6 =-I=I~=T==C=r:=c- ~~6 ~-I=i=L:::,:]=C=r:=~= ~~6 :::I=i=L::::J=C.=r=i-= m .::::r=I=-I=:J=C.J.== ~~6 fT=i=J-==-=r::J=C: m
445 -+--I-+-- -'---'--,-. 445 --+--,--t:----;-+--~.-l- 445 -:-t: I +--l ~~-I- 445. :-t:-I-:r.c-;i' I: --,-- 445 ---~-I-4--"-.t:-:--; -1- 445
440 - ':l"l:"":"l'-i~l~" 1 ' 440 111:1111~1111:llll~~/to~III:-111 .~440 - 1I.WI:IIU;Ji~~III:IIII: 440,. 111~1.J..L.IIII~I.llfii!JJII:IIII~11l 440.~.lll..f..J.J.'I.IIII:I.lli~~!6'JII:IIII;111 .~440
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100
490 T-I-T~-C T-I- 490 --I -I-r--'-r-L--- 490 -I-I--~-J-- ---r-,- 490 - '-1- I'-- - -.- 490 ---'--I-J-- __,c. -,- 490
485 --+---4_-1- _-L__. 485 ---'---- __J_L _. - 485 - ---J-- _,__-4_1-- 485 ---+---.-- --l~-"-b-- 485 _-1-__ -__J__,-J__,_. 485
480-:1:-1--~-- -i-::!-r- 480 -::t-I--1:--I-t--r-I--. 480 --+--I-t-J-r-i-I- 480 -'I--+--4-r--.,/-i- 480 -I-I--t--t-t----J-i- 480
475 -- ___1_-,__ --.475 - --- __I__L._,__ 475 __L__ _J._~_____. 475 ____l-1___-1/___ 475-~---i--'-- _--l.___ 475
470 -+-1'---+ -j--j---j-f- 470 ---I--I.-t----j--I--t-I- 470 -=j='__+-j--,---t--+-.!- 470 -..l-=;--j_I-_____-\--- 470--r ---+_-1_1--1-.6- 470
465 465 465 - - -.~ -==- '- 465 - -'- -1- _--~- -~ -- -- 465 - - - - -=-~~-=-=--::- -=-- 465
460 '::=+-=--1 -r--~ .--+=1= 460 -+-I-+--~'=f.--+"":I:-= 460 --1.-1-+ ----,-t--,-I-- 460--+-,--l-=-1-,--f-- 460 -+-I--+-~-l-----+-f-- 460
455 -I -1- 1:: -. -,,. -1- - 455 - - -1-'-' -, '-1-'-' 455 - T-- T -,-,-" -1- 455 -- --,- -1-- r" - C,. -1-. 455 - I -1-" - - C -, -1-' 455
450 - -- - . -' - 1--- -+ - - 450 - -L - -- -I- --J - 1--- -,- - . - 450 - -+- -1- ~ ---1-.1-- -+-- -. 450 .- + - - ---I - _L - - 450 -- . - - +- -J - --l - - 450
~~6 -;'~I"-!'-;-;'1'19~IWJ'-,t -1- ~~6 -;1- -!;o;-'1"'-';'m~ - -1- ~~6 -,~,,,!,,,;t;-I,,\rJll~'l!"""~.-m -1;:1t,"!iII'~~";'4~iliJ.u.:~~' ~~6_"I1II~!i11-4lL\.~~I~j- -r - ~~6
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 7.5 100
c
B
A
" . " ,.
GRAOING CROSS SECTIONS ~ VERT -
,. . ,. ".
STATIONS 131+00 TO 155+00 HOR -
SCALE IN FEET (2V: 1H EX)
NOTES
o EXCAVATE FIRE SUPPRESSION POND AS SHOWN ON SHEET C-2
o
DlMENSK>NS OF TYPICAl GfY.DING SECTIONS SttCI'M-l ON SHEET C-9
PlANTING RECUREMENTS SHCM'N ON SHEET l-3
PRE ''''NARY nF.sIGN NOT FOf> CONSTRUCT"," I
SHEET NAWEI I~ C8 0fW)1lC) CROSS SECTIONS II
I DATE- AND 1-..( PlOTTED: t.l15/288"1 11.11.1<11 AM
BY USERNAWE) KREY.PRICE (~TITLED WORKSPACE'
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Figure 9B Grading Cross Sections
490 _.1 490 490 I ~- -] r 490 - - -. 490 490
485 - -, - - , 485 - - 1_ 485 ..:;- - 485 -1 - -- 485 485
480 . - - ~ 480 ' -. :-1_-' 480 -1 -_ _ I -j ~ 480 .-_.t.... I ! 480 , 480
475 475 -~ -" - 475 -" 1 _L - 475 ~ - - - 475 c 475
470 470 - i--':: ' - 1- ! 470 -+ - I -i-t - 470 - -t - I ,- - 1-- -~ 1- 470 -, +, - . 470
465 465 -. ~-- 465. 465 --. 465 465
460 -c ,. 460' .J. - ~ :.:- --:-- 460 --;:: -1-- -' 460 - ~ - : " 460 - - - - 460
455 -, ,455 .J- ~ '-I - 1 -1 1- 455 J- -_'1' _- T 1 455, T -= I ~ ~ ,_.. 455 455
450 -0-' 450 - - . - 450 -+ , - . - 450 -l - -+ ~ .- l- -" -. I- - 450 -;- -. - .- 450
~~6 -" O;-i~'t1IS\TJt15J,-;1,,-;-r:- ~~6. "~"'''~iiu:''~'\'T;!JJ"t.I'' ~~6 -t --I -cr -i- t -::,~Ii,II. ~~6 -j.' -- !'~":"II!I'l;il1'-;-;-';o-,:,,-, . m ''':'''I:""r'';'i~~Wu' ~~6
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100
m -= J _,= 1 =:J __ ;_ ~ .:: c. ~~~ -= J ~ _ =-1 = C - ,= 1m I -=-,-= 1 m-l':: I - L =- - L m ::: I .:. L ~ m
480 - -r - - l' -i - , -., - ,- 480 . --4 -- ~ -+ ' , -:J' - 1-. 480 t -I - j -I - I - 480 -. j' - I ~ - , 1- 480 - ~, 480
475 _ _ _ _ ....J _ ._./'WE ANlL 475 _ _1. _ _ -'. .J _ j _ _ _ 475 _ _ _ - -- _J ~ 475-... - J. -, - - - 475 - - 1.. J._ L 475
470- -1 ~!' CO'N,'ACT F~ 470 --d - i 1 1 1- 470 - j - I - j 1 -" 470 i-I f - 1 -L - 470 ; J - t 470
~~6' f =1' ~ ~ - ,--"'1 m -+---~I- 1-1~~6 i I~-- ~~6 1, I ......., -1- ~~6 - l---.....r m
445505 - 1 - - J' I .. r - 455 - 1 - - - ~l-' - 1- - -1 -- ,-- 455 -r - -, --, . - r ~ 455 - T - J - I - r ,- 455 . == I T I - - 455
450 - J - - 450 - I -1,. I 450 I 1 450 . - , - , 450
445-,-'--~ -t-~-I-- 445 -~-- ~-t-~-t-r:-:- 445 :T:-l-~-,-,-j--r.--'--' 445 -~-'---' -.-lti-~-I- 445 '1-" -'-~-'-I- 445
440 UJWJlltllll;II' 440', 111;llll;lllljllllilfflWl:tlll,111 ~440 111;'111:1111~1111;11'9~b~llillllllll 440 ,-II':IIIIIIIII~llllil)*t(fJII.1111 - 440 1~1:llll:III'~' + - 440
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 lOa
490 -, --- I -, [490 -,- -. 1 ~ - -. - 490 ~... - T I 490 I - 490 - - 1.' - .. I' 490
485--1 _ __-1_ __ 485 ___ ' ~ ..- L _l_l~ 485 -1--1-. _J._, 485 -.-.-1-" - --, ~ -1- 485 - -1.- ...J__L.-_. - 485
480 . --4 - -, i -. - r 480 -iXC;:VATioN., , - L - - ,- 480 + - - J. c 480 ~ -I - " - - C -c - 1-" 480 . -1- r .~ -, - 1--. 480
475 _ _1 _ _ l ._ 475- _lJY''L~_ J _ ~ __'_ 475 ..J - - - - 475 . _.L - - ~ -- - 475 .. - - - J.. ....J - ~ -~- .-. 475
470 --' -. --4 -1- j --,--~ m--st..:..-~-:' ,_.'=-t--~-:= mi::- .j--juf--,__ m =-::t=-I._i_=t-=-~ m-_=I~-t=-I= m
~~6 --1.=-""" ::::j~- =1= 460 --+-- '. - -!- 460 +- ~ - -. 460.-1~-+-1-- 460 _...J. -I-~--' -1.- 460
455 -. -- ~~ - -1-.455 --,-- -' -J---'--'- 455 I-'-"-~-L - 455---,-- - -~-c- -- 455 --- -I-:c--,-,----,-. 455
450 - ~ __ 4- --1 _ , 1-- - 450 _ -1- _ __ -l _. -I. -,-- 450 - , .L -1 - -I 450'J. -I ..J. ~-! - ~ -1-. 450 -- -, -. -- - - l- ..e- 1- 450
445 , , 1 , I 445.--t----t:-j-j--t-1-:-:- 445 +-I--j---I-I-.-' ---. 444405 --"-,~..,,-,,.I'-"'~""-"".'i3i:u'-"'-'-" 1-' 445 ----I-+.--,-j-,t;-;-t-I- 445
440 11~1I"":IiII~'SIJJ~~"I;,iIl:1I 440 u.:..l..l.J.:..:~Il"i'lj~:~I:..! 440' +dJI:"I:'II, . . ., . 440 1I1:111I:"I1IIII)"IJ~w'JI - 440
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100
490 - -, - - T 'I 490 -,- - - - r:: - 490 I - ,- '1 -, . 490 I -- - - I - - -. 490 - - - - ,-, - T -- - 1- 490
485 _..J. _ _. , __ 485 _ --L _ _ J_ _ _ 485 __.J 485- -I J - - .- - 1- - 485 - ~ _I_.L --1 - L . e -- 485
480 - -4. -~. -. - -.. -- 480,- - -. - -I "- i- -, - r 480 "-1- ~ . r 480- T - I - -- - L- - -1--' 480- -;- -1- L --t - r -: - 1 -. 480
475 _ ~ __ ~ _ -'--.. 475 _..L _ _ ~ _J _ _ -' _ _ 475 L _ - L ..J . - 475 - -~ - - - - - . - - - - 475 -- - - - ....J - L- -- - --. 475
470 -!---- _' --J- -j--I- 470 --"i---- "j-t--t- '- 470 +-I-r-l-t- -+.-- 470 -+-I--{ -.-t--+-I-' 470 ----I-t--j-t--+-I,-. 470
m --""-:;--=~-=-=--= m ==i=---::- - -.' ,-- ==--- ~~6 +-I~~-::: ~~6--==1 -- .-~=~=. :~6 --~I-.. -,- m
455-,---] -,-' -,-- 455 ----- - " ---'-1- 455 '-I-I---'--' --.- 455 .'I-I-- --C"-I-' 455 -- -I---'-C-T-I-. 455
450- -' _,_ -! - ,- -l- -1-. 450 - -+ -1-. ... _, _ 1-- --1 __.. 450,- - - J_ .-, -, J __1_. 450 -- - - ~ -' - - - - 450.- -- - - -1- ---1- -.... - - 450
~:6 -,~,,7.':;o.'~'~IWT!ill,-;T,;o-,!tI'. :~6 "000,,,-.;o.,;,,~ -+t-c: -,i- - -. ~~6 . ,~,7.'!;-;-"~'II1.({I~t. ~ --,- m-7T, -1-- -7~'~\'ll!W,It,;o.!,,-, ~~6~'O:I,"I""i"'1'11~''':';-;'!- ~~6
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 50 75 100
490 - ~ - - '1 -, -- 490 - I - - T -] - r:: - -,- 490 -. T - -- I -. - r J - -. 490 -- I - - - -- - - - 1-. 490 490
485 - ..1. _ 1_ no ~ _ _ 1_ 485 _ _. - __ - _- -1 - ,-- 485 ~ -1- _--1 -. - 1_- 485 -- -I.. ~ - - '- - - - 485 485
480 -I- -1-' 1 -. - ,- -; -1-- - 480 --.:t -,- j- -, - t- :1-1-'. 480 ... ,-1- 1: -j - 1- -;-1-. 480 . ::t -1'- -" -, -- t- i -'1-. 480 480
475 _ _ _.L _ j _ , __ _ __. 475 _. _ _ ....J _ L _ _. 475 - - - ....J -. ,. ..J -- - 475 -- -.. J .- --- L ~ - -. 475 475
m -+-1--\ --1-' -=--=- m '::T~I-.=t_J= m: ~-I~-=I- m -.+=I:-+--'-t--:=r::: m m
460--+.=1- {> --J==-.%. - =1= 460 -+_1- ':.+-\- 460 -+-1-..............--+--:-- 460 - : -1- .Il -~-i= 460 460
455 -=T_-I_-T"-,,_-.lr_- .-_-1_-_ 455 ---'-T -!='-I- 455 --I-I-I-'-"--I-' 455 -I-I-----,-C--I-. 455 455
450 .. -' 450 _..1_ -, _ _ _1 - --I - -. 450. - - -1- ~ J -- - 450 -. - -l-. --' - -1. - - - 450 450
, I '.1J ,to;-;T 445 -~-I-tOl\-+--;T- 445 -I-+'-:-:i-,to;,-:t-, ,-",1--.445 -".1-",,+'-., -r.:-:t--1-.445 '" ""I r---l t- T "I
~~6 -~--;o.''7'~V~w'J' -- 440 :"",YI!'" 440 'WJ: I" 440 440-;--;o.':"'..L\'1~!UJ":''-:'- m
-100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100 -100 -75 -50 -25 0 25 50 75 100
2
3
o
c
B
A
GRADING CROSS SECTIONS
STA 106+00 ro 130+00
Q
,. .
VERT -----
" .
HOR ~~
SCALE I N FEET
. I
.
5
CD EXCAVATE SEASONAl PONDS AS SHOWN ON SHEET c-2
o
DIMENSIONS OF TYPICAl GAAOlNG SECTlQNS SI-KJWN ON SHEET c-e
PlANTING REQUIREMENTS SHOWN ON SHEET l-3
I f'!.aTf AI<<) TIMf P1nTTFO' 1/1'!t/2tMt"' 11.18.51_
25 so
;I
SO 100
;I
(2V:1H EXI
I BY US[RtUM[, KRfY.PRlcr CLftTtTlED It()RI(SPAC[ I
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I s;t€U NMLI 14 C7 OAADING CROSS SECTIONS I
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Figure 9C Typ~_al Cross Sections
2
.
3
-
(2) STA 138+00 10 139+00
o STA 139+00 TO 143+00
Q) STA '42+00 TO 143+00
CD 51A 138+00 TO 142+00
o
490 -- -. --1- - - I l - 7 490
480 ~ - _I~ -- --, -- -l 480
I :
470 '~--~~--+-- _c. 470
460 '_=-I_:2O"~_' - "C:.EG~' 460
450 ......... FG CTYl'l . I... t 450
-75 -50 -25 0 -25
490 -
480
0 470
460 .-
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rYPICAL SEcrlON INTSI
srA 138+00 TO 143+00
(D
TYPICAL SECTION INrSI
STA 144+00 ro 155+00
~
490 -
480 .--
470 .-
460 .- -
c
450
-ISO
,----
- -- - - r- - -
490
480
470
- . 460
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__ L<:: --r
_ _ _ -- _ I- .. - - - -- - - "" -. _L -- -
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150
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-100
o
50
100
rYPICAL SECTION INrSI
SrA 131+00 TO 138+00
Q)
490
Figure 9A. Grading Cross-Section
- ['- - - - -- -- - - -- - - --
n~ _ ---, ____ __ __ _
B
480 . ~ -.. - -- y~"~=- -- - -- 1- - - ~ -- -- -- -- -- ! - -- --.' 480
470 ,c...._ -- - -- i-=- ~~~'::<~,~~ SH~C-'T<L~_I---_ -- -- - ~ .- - -i'~~ 'f:+i=-.;( -- -:. 470
::~ .'-~~----~~-~~---~~-CFG: ~[TYPj '~F;" T4-:~ ::~
-250 -200 -150 -100 . -50 0 50
TYPICAL SECTION INrSI
srA 119+00 TO 131+00
w
490-,- ------,----- r--- -------1----- -.-.-- - ----.-T"
. ---j GRACE TO SMOOTH SlOPE r--- .
480 . ~- - ~~~IS] ~ Fou.OWlN~DEWATERlNG _-'-- _ __ _ _ -l-- _ _ _ _ _ _..1 __ _ _ _ __ ....L _
. I . j . .
~ 5.!!,IN -.l 1~ I
470 .:- -- - - - -j -~ - -- --+- _- - -:I'~,W'p." ;-1"1-;:;-- - -- -j - ~ -. ;-
460 . c... - - - - - -J - - - - - .L -~ - , , ~ - -I. ~-~ -- - - ~EG"lTYPl-
: I I 3 ~, m .," T 3 tG [TYPj I
450
-150
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- -- --).
.- 450
150
-100
-50
100
o
A
rYPICAL SEcrlON INrSI 0
STA 108+00 ro 119+00
50
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I DATE NC) TIoI( PlOTTED' 111~2erI 11.11..1 AM
BY 1JS(RHAM[1 KREY.Pfllct f.....TITL.ED wORt<SPACEI
490
490
480
470
460
NOTES
10 0 10 40
~-
SCALE IN FEET
CD All SECTIONS ARE L.OO,c:tNG UPSTREAM
CD
CD
LaN FlOW CHo\NNEl CENTERlINE
VAAlES +1- 6'PER 100' ALONG PCl.
PlANT1NG DETAA.S SHC7ft'N ON SHT l-3
PRELIMINARY DESIGN NOT FOR CON
SHEET NNlIEI 16 till TTPICAL SECTIONS
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, Mill Race Tax Lot #307
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\ Phase II Restoration Area ,-' '-
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4/24/09
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ATTACHMENT B
LIST OF FIGURES
FOR SPRINGFIELD MILL RACE RESTORATION PROJECT ~ PHASE II
Figure 1, Location Map (PHases I & II)
,
Figure 2, Wetlands Study Area Map (Phases I & II)
Figure 3, Flood Zone Study Area Map (Phases I & II)
Figure 4, Soils Study Area Map (Phases I & II)
Figure 5, Site Plan Review (Phase m
Figure 6, Planting Plans Typical Sections Stations: 108 - 155
Figure 7, Fill/Removal in Wetland Areas
Figure 8, Channel Profiles Stations: 145+00 to 105tOO
Figure 9A, Grading Cross-Sections Stations: 155+00 to 131 +00
Figure 9B, Grading Cross-Sections Stations: 130+00 to 106+00
Figure 9C, Typical Cross-Sections Stations: 155+00 to 144+00; 143+00 to 138tOO; 138+.00 to
131+00, 131+00 to 119+00; 119+00 to 108+00 .
Figure 10A Erosion Control West Portion of Mill Pond
Figure 10BErosion Control East Portion of Mill Pond
Figure 11A, Existing Electrical Facilities
Figure 11 B, Existing Water Facilities
Figure 11 C, Existing Sanitary Sewer and Stormwater Facilities
"
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ATTACHMENT C
REDUCED SITE PLAN 8.5" x 11"
FOR SPRINGFIELD MILL RACE RESTORATION PROJECT - PHASE II
Figure 5. Mill Pond Restoration Site Plan
,,,S~-"".II.I1,,M
Legend Data Sourre; Telra Tech, Inc.
P ....~,: I Restoration Planting
...", Ash Forested WeUand
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~
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.-..
~
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<::::::, Top of Bank
Project Elements
~ Stormwater Treatment Ponds
--""'- Trail
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r-....-! Proposed Parking
~-_..--
c Trail Signs
J<lO
/
. ATTACHMENTD. . I
. . HYDROLOGIC AND HYDRAULIC ANALYSIS
FOR SPRINGFIELD MILL RACE RESTORATION PROJECT - PHASE II
~ ,.
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"P",-",*,
Springfield Mill Race Section 206 Project C
Lane County, Oregon
Floodplain Documentation
April 7,2009
Purpose
The u.s. Army Corps of En:gineers prbposes to construct the Springfield Mill Race Section 206 project in
cooperation with the City of Springfield and the Willamalane Parks and. Recre1!tion District. The
. . . . ~
Springfield Mill Race Project provides a new inlet connection to the Mill Race approxijnately 1,500 feet
upstream of the existing connection to the. Middle Fork Willamette River. The pr?ject also includes
rernoval of the Mill Dam and regrading of the Mill Pond area. The activities proposed aspalt of the
. . r .
Springfield Mill Race project include fill and removal of sand, gravel, and rock material, placement of
.'
large woody debris; and installation of cOlicrete blocks within FEMA Zone AE. The proposed activities
also include excavation of material and removal of an existing outfall within the' FEMA 'Zone 'AE
Floodway. No fill ~r otherencro~chment~ are proposed ~ithin the Zone AE F1oodtvay; th~ proposed
activities within the Zone AE Floodway do not result in an increase in floodway elevations. The activities
located within Zone AE are located in ineffective conveyance areas for the base flood and the
. II .
corresponding increase in base,flood elevations modeled in HEC~RAS .is less than 0.91 feet in elevation.
change. This document provides hydrologic and hydraulic data in support of the Floodplain Development
and Floodplain Fill and Removal permit applications submitted to Lane County in Mar6h 2009.
i
As a duly qualified engineer licensed to practice in the State of Oregon, I hereby ,certify that I have
performed a hydraulic analysi's of pre- and post-project conditions for the Springfield:'Mill Race Project,
with results ,md conclusions as referenced above and in the attached documentation.
."
Krey H. Price, P.E.
Tetra Tech, Inc
,.
1020 SW Taylor si: #530 Portland, OR 97205
"
,
EXPIRES OEe 31)',2010
(503) 223~5388
SpringfieldMiJlRace
Section 206 Project
Floodplain Analysis
Project Description
The Springfield Mill Race Section 206 Project is being conducted under Section 206 of the Water
Resources Development .Act of 1986, by the Portland District Corps of Engineers (Corps) in
cooperation with the City of Springfield arid the WilIamalane Parks and Recreation District. The project
site is located along the Springfield Mill Race, which is a diversion off of the lower Middle Fork
Willamette River near Clearwater Park at approximately River Mile (RM) 190.8. As shown in Figure I,
the Mill Race flows for approximately 3.5 miles to the northwest and rejoins the main stem Willamette
River at approximately RM 185 near downtown Springfield, Oregon. The Mill Race follows a
meandering northwesterly course through natural and agricultural lands, past rural residential, urban and
industrial areas and into a 30"acre Mill Pond about 3 miles downstream of its inlet. A dam about 15 feet
high contains the Mill Pond. The proposed project will restore and enhance off-channel habitat along
approximately 3 miles of the Springfield Mill Race over an area of approximately 40 acres. The project
includes removing the Mill Dam and relocating the inlet approximately 1,500 feet upstream.
As shown in the Figure 2, the project comprises the following features:
~
.
Placement of three timber-pile supported large woody debris clumps. Two of the clumps are
located within FEMA Zone AE. All clumps are located outside the Zone AE Floodway.
Construction of a rock and bioengineered bank The proposed revetment is located outside of
Zone AE.
Excavation. of existing bank material to' construct 'a new Mill Race inlet The toe of the.
excavation footprint overlaps the Zone' AEFloodway. The excavation area covers
approximately 1,250 square feet with a total excavation quantity of less thari 100 cubic yards
from within the Zone AE Floodway.
Relocation of an existing 66-inch diameter storm drain pipe. The pipe outfall is located within
the Zone AE Floodway for approximately 5 lineal feet. The remaining pipe is outside Zone AE.
The trench backfill will be to the existing grade or lower and will incorporaie rock materiaL.A
pump intake is to be located in the vicinity of the existing storm drain.
Reconstruction of the existing parking lot, construction of a culvert crossing, and construction
of a new parking lot These features are located outside of Zone AE.
Placement <if large 'woody debris. As shown in Typical Section I in Figure 3, approximately 40
pieces of large woody debris are to be placed along the stream banks of the Mill Race within
. Zone AE.
Fill placement. As shown in Typical Section 11 in Figure 3, fill is to be placed in the channel bed
and overbank to prevent fish stranding and contain flows along the new Mill Race inlet channel.
Approximately 3,750 cubic yards of material is to be placed within Zone AE, including sands,
gravels, and rock.
.
.
.
.
.
.
2
April 2009
/
Floodplain Analysis
Springfield Mill Race
Section 206 Pr~ject
.
I
Channel excavation. As shown in Typical Section 111 in Figure 3, the new Mill Race channel
includes vegetated floodplain terraces. Approximately 13,600 cubic yards of material is to be
excavated from within Zone AE.
.
Flow constriction structure. Three existing culverts are to be removed and replaced with a
concrete block flow constriction structure. The structure consists of 26 30"'x30"x60" precast
concrete blocks spanning approximately 30 lineal feet on each bank. The structure is located
. r
within Zone AE.
.
Re!!,oval of the Mill Dam. The dam is to be removed and the Mill Pond area is to be regraded
and revegetated. See the attached vicinity map. The Mill Dam and Mill Pond are.located outside
of Zone AE.
I,
Riparian restoration. Invasive species removal and riparian and wetland plantings are proposed
along the new inlet. See Figures 1,2, and 3.
.
Topography
~. .
The Corps of Engineers, Portland District.conducted hydrologic and hydraulic analy~es for the project
as part of a 2003 feasibility report. Topographic'data for the HEC-RAS modeling were derived from'
2000 contour mapping at 2-foot contour intervals provided by the City of Springfield. Aerial
photography was collected in 2004. Supplemental points were collected using a level, handheld GPS,
and total station in March and August, 2008. The data sources were merged into a single 3D surface
using Bentley InRoads software, and the HEC-RAS modeling was updated to refllct changes to the
. proposed design. All project features are projected to NADS3. Oregon State Plane,:, South Zone. The.
vertical datum for all project features is North American Vertical Datum (NA VD88).: Previous models,
including that utilized NAD27 and NGVD29 were converted to NAD83 and NA VDSS for use in the
1,
project mapping. Unless otherwise noted, all elevations in this report are relative to NA VDSS. .
Bathymetry
Bathymetry in the Corps of Engineers modeling was based on hydrographic 'su~eys conducted in
March and May of 2000. An updated bathymetric survey was conducted along the same section lines in
. .
October 2007. Figures 8 and 9 show cros,"sections cut at the existing and propos~~ inlet locations in
2000 and 2007. The thalweg degraded several feet in both locations over the sevenjyear time period,
with some aggradation'on the left bank gravel bars. Figure 10 shows the profile view. ,The profile shows
bed degradation throughout the entire reach, with some deposition further downstream. The most
Iprominent features along the thalweg profile are an abandoned gravel pit located downstream of the
existing Mill Race inlet arid a deep:scour hole I~cated near the proposed inlet. The gi\'vel pit and scour
hole have remained fairly stable over time in terms of river station. A smaller head' cut, however,
migrated upstream several hundred feet between 2000 and 2007. The migration rate h,as been somewhat
episodic; ih one instance, iUs reported to have moved several hundred feet upstream ih one winter, with
relatively little migration occurring in other winters. If the average rate observed since 2000 were to
. . . i
~
3
April 2009
Springfield Mill Race
Section 206 Project
Floodplain Analysis
continue, the head cut (which was located approximately 100 feet upstream of the existing inlet location
in 2007) would reach the downstream end of the deep scour hole (approximately 300 feet downstream
of the proposed inlet location) in approximately 20 years. The head cur migration will most likely halt
. when it reaches this scour area; however, the overall reduction in the thalweg profile along with the
associated backwater conditions would result in a reduced water surface elevation at the pr9posed inlet
location in some flow conditions.
Flow Frequency
Additional gage records were obtained to update the Corps of Engineers findings to current conditions.
A comparison of the previous findings to the entire period of record shows a slight difference in flow
recurrence (Figure 4). The exceedance curves are nearly identical for the two post-reguhition periods of
record. The mean and median discharges are approximately 100 cfs lower for the extended period of
record, a difference of 3%. The project increases the frequency of lower flows in the Mill Race while
limiting flood flows to present levels for areas of the Mill Race within the project limits (Figure 5).
Flows in the Mill Race vary with flows in the Middle Fork Willamette River. Some base flow enters the
Mill Race through storm drains and other surface drainage into the Mill Race; however, these base
flows are minimal relative to the flow rates driven by the Middle Fork Willamette River conn~ction at
the Mill Race inlet The monthly flow variation in the Middle Fork Willamette River is shown in Figure
6. In summer months, flows in the Mill Race have generally been supplemented with pumping. The
flow exceedance curve is broken into winter and summer flow conditions for comparison in Figure 5.
The highest flow measured since 1999 was 21,000 cfs, approximately equal to the 10_year return period
runoff event determined for the 1999 Flood Insurance Study. The peak discharges measured during the
additional period of record (1999-2008) correspond closely to the expected trends from the previously
determined peak flow distribution. Likewise, the distribution of runoff throughout the year has remained
similar, with snowmelt and reservoir releases appearing to affect the runoffhydrograph in the spring and
late summer.
Roughness Coefficients
The 2003 Corps model and the 1999 FEMA model apply roughn~ss coefficients for the Middle Fork
Willamette River taken from a 1978 HEC-2 deck prepared by CH2MHill, Inc. Based on notes taken in
1999, Ken McGowan, the Floodplain Man~ger at the 'time, reported that the HEC-2 model was
calibrated. to measured water surface elevations upstream and downstream of Clearwater Park. The
calibrated main channel roughness coefficients were approximately 0.02 to 0.03 in the vicinity of the
Mill Race Inlet. Subsequent HEC-RAS models prepared by ihe Corps of Engineers in 2004 required'
Mannings n values of 0.045 to 0.055 in the same reach of the Middle Fork to calibrate to recorded water
surface elevations. As shown in Figure 7, the roughness coefficient resulted in an increase in computed
water surface elevations in the vicinity of the .Mill Race inlet. The water surface elevation in the. inlet
area was surveyed on 3/12/08,5/26/08,8/29/08, 11/21/08, 12/27/08, and 2/9/08. A comparison of USGS
preliminary discharge data for the dates of survey confirms the rating curve for the model with the
calibrated n value.
~
4
April 2009
Springfield Mill Race
Section 206 ,Project
Floodplain Analysis
Existing Floodplain
The existing Mill Pond is not located within the mapped FEMA floodplain for the base flood (see
Figure 16). The Middle Fork Willamette River floodplain extends into tl;e Mill Race ~pproximately 800
feet to the South 2"' Street Bridge. Upstream of the Mill Pond, the mapped floodp,iain covers Jasper
Slough, Quarry Creek, Gorrie.c:::reek, and the Mill Race upstream of the South 18'h Street Bridge (See
Figure 17). The inlet area floodplain and floodway are shown in Figures 2 and 18.
Inlet Confignration
Although the proposed inlet invert is at an elevation that connects to the Middle Fork Willamette River
nearly 100% of the time, during some time periods the shallow depth in the inlet y,.'ould. not provide.
sufficient head for open channel flows in the Mill Race. Water depths would likely need to reach I to 2
feet before sustained flows would be possible. Although pumping requirements would be reduced with
. . ~
the proposed inlet configuration, during some low 'summer flows, a pump will still be required to
'I
maintain year-round flows into the Mill Race. When .the head cut reaches the scour hole, the water
surface elevation at the proposed inlet location could potentially drop to th~ s~me frequency of
connection currently exhibited at the existing inlet location; by'that time the existing inlet location
would have become even further disconnected.
The need for dredging at the new inlet will be reduced compared to the existing inlet due to the location
of the new inlet within a degradational zone. Some aggradation could occur in the proposed inlet area
;'
without affecting the design discharge in the Mill Race. Lowering the inlet further would not improve
the connection times because there is not enough elevation drop to the downstream Mill Race to provide
flows at a lower inlet invert elevation. To be effective, any further lowering of the iiilet would have to
be accompanied by large-scale excavation of the Mill Race channel, which is not being considered at
the present time. ;,
Jasper Slough
,.
An additional design consideration is the effect of the proj~ct 6h water surface elevations at Jasper
Slough. Jasper Slough serves as an oyerflow side channel, for the Middle Fork Willamette in extreme
(-IOO-year) flows, connecting to the Mill Race approximately 1,300 feet upstream':of the 28"' Street
Bridge. Figure 20 shows a plan view. Although several storm drains and other 10fal surface runoff
sources drain to Jasper.Slough, the Slough i~ generally a backwater of the Mill Race. As such, the water
,
surface elevation in the Mill Race at its confluence with Jasper Slough governs the J'!5per Slough water
surface elevations for a half mile upstream of the confluence. Supplemental hydrologic and hydraulic
analyses were conducted to evaluate the potential effects of the lower Mill Race water surface elevation
on Jasper Slough.
Table 2 shows that the project effect on water surface elevation~'at the Jasper Slou}!;h confluence are
very similar to the effect at the Gorrie Creek culvert described below. Velocities' are shown for the
@
5
April 2009
Springfield Mill Race
Section 206 Project
Floodplain Analysis
adjacent Mill Race channel; velocities within Jasper Slough are negligible under both existing and
project conditions. The maximum effect on the water surface elevations considering a wide range of
flows in the Mill Race is 0.9 feet. The greatest effect occurs when flows are between 50 and 100 cfs in
the Mill Race channel, representing a typical winter condition. Above and below this flow rate, the
effect is dampened. The areal effect of the lowered water surface elevation varies with the side slopes.
In zones with steep side slopes, the area affected by the lowered water surface elevation is minimaL In
areas with milder slopes, the effect is much greater". To evaluate the areal effect of the lowered water
surface, eight bathymetric cro'ss sections were taken within Jasper Slough on November 15, 2008. The
cross sections show that in the vertical elevation zones affected by flows exhibiting the highest
difference in water surface elevations between existing and project conditions, the channel side slopes
vary from near vertical to approximately 2H:!V, The side slopes flatten to between 5H:IV and !OH:!V
both above and below this zone. Figure)! shows the effect schematically.
As shown in Figure 21, the top width of the Jasper Slough water surface is reduced by a maximum of
approximately 4 feet. The associated area affected by the' project changes (inundated under existing
conditions and exposed during project conditions) along the approximately 2500 foo.t length of the
Jasper Slough backwater zone is a total of approximately 0.25 acres located along the edge' of each
bank. With the dam removed, the channel slope in the Mill Pond area increases from essentially flat to
0.23%. Velocities increase accordingly from near zero under existing conditions to 2-5 fps with the dam
removed.
Comparison of Res nits
Figure 10 shows a comparison of the modeled water surface profiles with 2000 and 2007 bathymetry.
The rating curves for the Middle Fork Willamette cross'sections at the existing and proposed inlet
location are shown in Figure II. The cross sections are shown with selected water surface elevations in
Figures 12 and 13. In general, the Willamette River water surface elevation at the proposed inlet
location is approximately 2 feet higher than at the existing inlet For higher flows (2-year event and
higher), there has been relatively little change in the rating curve at the proposed inlet location;
however, for lower flows (below 80% exceedance discharge), the migrating head cut and channel
incision have contributed to a water surface approximately! foot lower in 2007 than in 2000. Thetrend
will most likely continue as the head cut continues to migrate upstream. The gravel deposition at the
boat ramp that has occurred over the past decade will likely begin to erode as the head cut continues
migrating upstream; however, the boat ramp is located in a depositional area shielded by a rock-
protected riverbank and will likely continue to experience episodic deposition of gravel and other
debris,
A key design criterion at the proposed inlet is to avoid increasing flood flo~s in the Mill Race above .
current levels. Under existing conditions, water surface elevations in the Middle Fork Willamette River
reach the existing inlet approximately 80% of the time; however, substantially higher water surface
elevations are required to actually maintain flows downstream into the Mill Race. The City currently
must provide pumping to maintain flows in the Mill Race during most of the summer. Median flows
result in depths of approximately 1 to 3 feet through the inlet channel with discharges on the order of
~
6
April 2009
Springfield Mill Race
Section 206 Project
Floodplain Analysis
100 cfs. A gravel roadway with three existing 48"inch diameter CMP culverts becomes a controlling
feature during high winter flows that approach the top of the culverts with flows of20'0-300 cfs. During
Willamette River flood flows up to the 2-year event,. the culverts are submerged, but the roadway is not
, ~,
overtopped, During these events, the flows split just upstream of the culvert, and most of the flow is
diverted through a.side channel (North Channel) to rejoin the r'ain river. Culvert velocities under
submerged conditions approach 10 fps. In extreme flood events in the Middle Fork Willamette River,
the maximum discharge through the three culverts can approach 400 cfs just prior to overtopping of the
roadway. The corresponding Middle Fork Willamette River flows are approximately 20,000 cfs. The
gravel roadway is not designed for overtopping and would likely wash out under this scenario.
Under proposed conditions, the Mill Dam will be removed and replaced with a composite channel. The
proposed design utilizes a composite channel with a 12-foot bottom width and high-flow terraces. The
"
dam removal and channel construction affect the water surface elevations and velocities in. the Mill
Race upstream of the dam. The hydraulic effect of the dam removal extends several miles .upstream
from the dam site but does not affect the inlet area. Figure 19 shows the velocity profiles .for typical
.. ~
winter flows in the Mill Race under existing conditions with the dam in place ana under proposed
conditions with the dam removed: In low flows, the effect (lower water surface e1~~ation and higher
velocities) disappears near. Kinzley Road, approximately 2.5 miles upstream of the~ dam site.. During
flows above the 2-year event, the. effect disappears at the existing gage weir approximately 3 miles
- .. _..1
upstream of the dam. ' "
Due to the relocation of the inlet, the recurrence frequency Of a given flow wiIV increase In most
, 'l
conditions. The water surface elevation associated with a particulafflow, however, will decrease due to
the elimination of backwater from the Mill Dam. Because the water surface elevation will be lower,
flow rate~ in diversions such as. the Gorrie'Creek culvert may be affected. To avoid an'ladverse impact to
the available flow, the Gorrie Creek culverts will be lowered. As shown in Table I, the maximum effect
in any given flow is a 0.9 foot reduction. The culverts will be lowered one foot to compensate for the
potential lowered water surface elevaiion. In conjunction with the culvert lowering,)minor excavation
within the Mill Race will be needed to forma pilot channel to the.new culvert invert:. Fish screens will
1
be needed outside the sluice gates. A customized configuration may be required to form a screened
channel entrance that attaches outside of the sluice gate. Periodic maintenance of the fish screen will be
required to remove accumulated debris.
Effects on Floodplain.and Floodway
Cross sections adjacent to project features were modified in theHEC-RAS model of the Middle Fork
Willamette River to sim'ulate the potential effects on the regulatory floodplain ana floodway. As a
.conservative approach, only 'encroachments and fill were modeled, while excavation and removal of fill
I,
were ignored. The only encroachment in the proposed inlet area is the placement of lar~e woody debris..
The large woody debris placement is proposed outside the regulatory floodway; however, two pile-
supported large woody debris clumps are located 'within the 100-year floodplairt.. The proposed
placement location is in an area that under typi~aI flow scenarios is separated from the main channel by
an island. As shown in Figure 23, Section 20976 was modified to simulate the addition of large woody
@
7
April 2009
Springfield Mill Race
Section 206 Project
Floodplain Analysis
debris. As a conservative approach, the entire side channel was converted to 'an ineffective flow area in
the HEC-RAS model. This would reflect a case in which the large woody debris clumps snag additional
debris or cause some aggradation that would inhibit any effective flow in the side channel. The effect of
the change in the'model is shown in Table 3. The resulting change in water' surface elevation is
approximately 0,0 I feet, and,the resulting velocity increase is 0.03 feet per second. As shown in Figure
2; the large woody debris placement is proposed outside of the floodway encroachments; therefore,
there is no effect on the regulatory floodway.
In the existing inlet area, some till is proposed to prevent fish stranding along the channel thalweg and
to separate the existing channel from the proposed Mill Race inlet No fill is proposed within the
regulatory floodway; however, some fill is proposed within the floodplain. As shown in Figure 24,
Section 18865 was modified to reflect the fill placement As a conservative approach, a complete
blockage was inserted into the HEC.RAS cross section at this location at an elevation exceeding the
proposed fill elevation. Because the proposed fill is located in an area that, although wetted, provides
ineffective flow conveyance, the complete blockage causes only a reduction in top width and does not
result in any increase in base flood elevations or velocities: Likewise; the blockage is located outside of
the floodway encroachments and therefore has no effect on the regulatory flood way The tabulated
results are shown in Table 3. Figure 25 shows the profile view of the existing and proposed conditions
water surface elevation. As shown in the profile view, the two profiles plot directly on top of one
another, and the project effects on the regulatory floodplain and floodway are negligible, The electronic
HEC.RAS files, including flow, geometry, and plan details, accompany this summary report.
~
8
April 2009
Springfield Mill Race
Section 206 Project
Floodplain Analysis
FIGURES AND TABLES
/
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LOCATION
Figure 1: Vicinity Map
@
9
April 2009
Springfield Mill Race
Section 206 Project
Floodplain Analysis
,
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Figure 2: Site Plan
~
10
April 2009
Springfield Mill Race
Section 206 Project
Floodplain Analysis
4SC
.------~^'
1I,:~~:~~:;1i::r~~~~a:; ~"';i::i:rU::;m~:::;/lJNas i
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TYPICAL SECTION 11
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Figure 3: Cross Sections
j',
~
11
April 2009
Springfield Mil] Race
Section 206 Project
100
90
80
.
f"
.
~ 70
u
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1,000
Floodplain Analysis
Willamette River at Jasper Flow Exceedence
~
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1-1967-19991:
1-1967.20071,
I
I
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I
10,000
Discharge (cfs)
Figure 4: 2007 vs. 1999 Exceedance Curves
100
90
80
Willamette River at Jasper Flow Exceedence
,.
T\ ",
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, ,
i; ,~i
i: \\
, ,
Disch~rgeRequiredfor
lnibal Connection at
Existing Inlet Location
(-1800 c15, 80%
exceedence)
"
I
I -W!nter (Ocjober-March) I
-Total Regutated Reco~ (1967-2007) ,
! I -Summer (Aprif.September)
Discharge Required for
CD Ini~aICoflner;tion8t
f: 70. ,----ProposedlnletLocation
g (-500cfs,l00%
:0 exceedence)
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1,000
100,000
Discharge (cfs)
10,000
Figure 5: Summer VS. Winter Exceedance Curves
@
12
April 2009
Springfield Mill Race
Section 206 Project.
Floodplail1 Analysis
Middle Fork WiIlamette River at Jasper, Monthly and Annual Averages
7000 -.
6000
5000
~ 4000
'"
.
m
:;
~
0
. 3000
is
2000
1000
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Figure 6: Monthly Flow Distribution
Rough~ess Coefficient Sensitivity
490 I
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-Thalweg
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16000
16500
17000
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18000
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Station eft above confluence)
Figure 7: Effect of Roughness Coefficient on Water Surface
~
,
13
April 2.009
Springfield Mill Race
Secllon206 Project,
495
490
485
c
~ 480
z
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.
o
~ 475
ill
470
465
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1500
Middle Fork Willamette River at Proposed Inlet (looking-downstream)
I ~ ~ ~ 2000 Bathymetry I
-2007 Bathymetry
1600
1700
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1800
Station(ft)
Figure 8: Cross Section at Proposed Inlet Location, 2000 Ys. 2007
485
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W 475
473
471
469
200
Middle Fork Willamette River at Existing Inlet Location (looking downstream)
400
600
,~
,----
Figure 9: Cross Section at Existing Inlet Location, 2000 vs. 2007
~
600
1200
1000
Station{ft)
14
~.G/-
I ~ ~ ~ 2000 Bathymetry I
-2007 Bathymetry
1400
1800
1600
Floodplain Analysis
2100
2000
April 2009
Springfield Mill Race
Section 206 Project
490
485
480
il 475
,.
~
Z
- 470
t
.2
~
.
iU 465
. -----~~
- - - - -~ __'_-t"-.J
~r-' \,
_~-~. I,
Discharq~.. _~~-
I ' ~
--~
'8do;('~ence . ~ . L ~. -:...".........
. Dischar~ .r--. __ 1"--_ -/ 350~ /' '.100911 -.............
I-~ _~~dC~
Willamette River Thalweg Profile
Existing
Inlet
Location
Top of Bank
--------
460
455 :..-
-Water Surface Elevation, 2000,Bathymetry
-Water Surface Elevation, 2007 Bathymetry
-Thalweg, 2000 Bathyme~ry
- Thalweg, 2007 Bathymetry
Floodplain Analysis
....--
,. ~ ...proposed' I
- - \~: Inlet '--.J
_--\B"lio!f,
\ I
I t
I I
'-f-j
II' I
1 'i
\' I
450
16000
17500
18000
18500'
--
Sop,,, ~
"'(/'
19000
1~500.
20000
16500
17000
Figure 10: Middle Fork Willamette River Thalweg and Water Surface Profile, 2000 vs.. 2007
Station (ftaboveconfluence)
Middle Fork Willamette River Computed Rating Curves
490
Top of Bank Elevation at Clearwater
485
il
,.
~
z
"
-; 480
.2
"
>
.
iU
.
o
~ 475
'"
Inlet Thalweg
(
Ii
.
~
w
'"
~
.
0 .
u: 0 .
. t "
.
c u ~
S . ~
.
t ~ "
. w .
~ '" .
. '" >
~ N
5,000 10,000 15,000
...
. . .
. " " ~
" . .
. ~ ~ ~
~ ~ ~ ~
~ " " "
" . . .
. !<. l'- .
!<. ~
" 50 75 100
20,000 25,000 30,000 35,000
.
"
~
470
465
o
Discharge (cfsj,
Figure 11: Existing and Proposed Inlet Location Rating Curves
~
15
I-Proposed Inlet)
--Exislinglnlet
f'
April 2009
Springfield Mill Race
Section 206 Project
Floodplain Analysis
Middle Fork Willamette River at Proposed Inlet (looking downstream)
495
490
c,,,"',,,, p"" J
;0
\
~
'C7
I
I
I
I....
I
<j
\.I.
4851
2-yeardischarge
'V
0'
~ 480
z
80% exceedence
discharge
c
o
"
~ 475
.
W
465
Proposed Inlel
Thalweg
470
460
1500
1600
1700
1800
Station (ft)
1900
2000
2100
Figure 12: Water Surface Elevations for Cross Section at Proposed Inlet Location
Middle Fork WiIlamette River at Existing Inlet location (looking downstream)
485
I
L 2""" d.'''''..
/
I. .' /-
I
~~
4B3
szc
461
C 479
>
'"
z
"
~471
o
"
.
>
.
W 475
473
BO% "re'd.oc.1
~oha~: I
I
~
Existing North Channel and Millrace Inlel Thalweg
471
469
200
400
600
BOO
1000
1200
1400
1600
1800
2000
Station (ft)
Figure 13: Water Surface Elevations for Cross Section at Existing inlet Location
~
16
April 2009
Springfield Mill Race
Section 206 Project
Floodplain Analysis
,
,
i
1
i
1
490-
MU Race MR-1
Legend
485.
WS 400cls
WS 200cls
WS 100cfs
WS SOcfs
Ground
leflLevee
g
o
j
w
100-year WSEL
1 ________
I
r.._m......
J
i I
5% Exceedance
Typical Winter WSEL
Average Annual WSEL
475-
23250
23300
23350
23400
23450
23500
235~O
Main Channel Distance (f1)
Figure 14: Water Surface Profiles through Proposed Clearwater Lane Culvert
<--'--- .08 i. .032 .08-----1
492
Legend
490
486
48.
S 484
0
.0
,1i
. 482
W
480-
478-
476-
47:
v 20 40 60 80 100
Stalion (ft)
WS 400cfs
WS 200 cIs
WS 100 cis
WSSOcfs
Qound
.
BankSta
Figure 15: Cross Sectional View of Clearwater Lane Culvert
~
17
April 2009
Springfield Mill Race
Section 206.Project
Floodplain Analysis
I \ \ 'I
---:i..,-_.+--~~ -
/ I" \. I
- \ .
\ I
, ,
";;w>tr,;"".!
,;;Yl.::::-e,.,
-i~I i
,
"if
Ir"
I ~ /
;1-" #.
I --<..
! i '\
; ,I ..
-W"
i"
--~J' )-~'~..
-, ~"I t
~^
~'" -:--"---,-~~
l ,,,,. l\~~"^~T~-'::;'-;;:;;;:;
!~ ~<,--
, ' \ I --- \ "-
\. ~hN~''':::''If'o\_
--Ii . /::<:>_~U"~~;'OC'.!'~ .. ~:;,,'_..._~-._---____
~ t-k ~',
"<' ~ ~~;~~
...."......'\;;:........ tJ~'I<<.;~~~~~~~}~~Il;::"- ~..
\ .iWI'l -;
l..">.Kf: ())U~'l,\'.
(;ltl-;(;u~ .\tm ,
IS:COj{Y()H,-\TW ARE,\.'! 1
P.u:!:lllU 1l11m ~
~<.."."",..<',.~"...,=", j
W\"..~._"t.
~-- ~
lWKWEtl
4I~moo r!
HIT.."1Mtlrl::
liltlfUn!
i
.,
.j
Figure 16: FEMA Flood Insurance Rate Map for Mill Pond Area
,
i
"
r-
~,
:::::::::::::::-"-";':"-::::0' -'::__ ,.__"":.
-~--~-=-----
, ,,-
Return Interval
lO-y'ear
50-year
100-year
500-year
...J
Discharge (cfs)
20,000
25,100
35,500
81.000
lI.Ill:llll.ltm l!IlS1IIttfRtGWIl
f-
-~
FIRM
rUlBlIt~lArtml'
{.Al-;t: CQV"1Y,
OREGON ANf}
lK(X)ttI'OllA'l'1ID AR&AS I
~_~~5,....,.,",''''''''~ '
-.
f.K"~_
;~
.~l:>'U,;:z;. ff.t.
~Y"'"'
lUlli1llBil
""""'''
mum tm:
=2.tm
Figure 17: FEMA Flood Insurance Rate Map: Mill Race, Quarry Creek, Gorrie Creek, Jasper Slough
~
18
April 2009
.r'
Springfield Mill Race
Section 206. Project
Floodplain Analysis
MiDDLE FORK ,
\'JI.LAMETTf.;. RiVER! v
!r1M194,
I
Return Interval
10-year
50"year
100-year .
500-year
Discharge (cfs)
20,000
25,100
35,500
'81,000
Figure 18: FEMA FIS Flood Delineations and Discharges for Inlet Area
Mill Race MR-1.
3
~ !
lij~'
i\ 1/ Project ~
\ V .
\
I.
,
'(
\
Existing
Dam
Pond
Entrance
"'
~
c 2~
.c
0
ill
>
28"'51.
Bridge
~,
L
Ii
I
\, 1\
II' Ii
Ii 'i
Ii I,
\ I' II
~ \ ,i I \
i ill Ii
i \, i "\ i I
~r 1\ I" ~ i
\ III I' \
V j \1 \V\Ai
I 'I
,
\
,
F 51.
Bridge
'I,
1.
;\
I
I
\ I':
, J',t:
.'\d:' ~ ,'"
~ ,,- - ~ '
\
\
\
Existing
o.
5000
10000
15000
20000
Main Channel Distance (ft)
Figure 19: With- and Without-Project Mill Race Velocity Profiles for Typical Winter 'Flows
~
19
April 2009
."
,
Springfield Mill Race
Section 206 Project.
Floodplain Analysis
Figure 20: Jasper Slough
I Existing ground
Without-project water surface
\7 .
\I
With-project water surface
-+ --- max 2' top width
reduction (each side)
-
~~";-:~~~
Il!t~~~~"'~ .
, !t1i1~tf~?t'eai'{cHon
f.:;~>>~t>>'<"
Figure 21: Jasper Slough Schematic Section
~
20
April 2009
Springfield Mill Race
'Sectio'"! 206 Project
490.
'48':::
480
g 475
c
0
~
W 470
465
460
455
17500
Floodplain Analysis
Sprir9field RoodplaTn - .. Plan: 1)Existing 4/6/2009 2) Prop::lsed 416f2009
18,000
c
~
Existing and
proposed water'
. surface profile
Existing thalweg
at proposed inlet
Station 18865
18500
19000
19500
20000
1 Legend I
WS Mnimum Row. Existing I
VY,S Minimum Row- Proposed,
",o"od I
i,' Ground
Existing thalweg at
,.
proposed :inlet
Station 20976
20500
Figure 22: Middle fork Willamette Water Surface Profile, Existing vs. Proposed Conditions
"
.:
495
490
485~
g
c
o
~
W
480
475
""0
MlinChanneIOislance{f1)
SprillJfield Roodplain, Plan: 1) Existing
soo
1000
2) Proposed
I
~.
Legend
WS Mnimum Row. Proposed
WS Minimum Row. Existing
l..~';."'\.."."",,,.,.,,,.,,""....m~.
. Proposed
Ground. f'roposed
heff-Proposed
.
8ankSta-Proposed
G'ound-.Exis!lng
Ineff-Existing
.
BankSta.Existing
Ineffective flow
conveyance added for
L WD pl~cement
3000
3500'
~
Stationjfl)
I Figure 23: Proposed Inlet Area Cross Section, Existing vs. Proposed Conditions (Station 20976)
~
1500
2000
2500
21
April 2009
Springfield Mill Race
Section 206 Project
Sprin;:jf!eld Aoodplain. Plan: 1) Existing
4951
490. \
485. Lv
g
0
0 480-
~
W
475-
470
4':':.
0 1000 2000
2} Proposed
Blockage for proposed
fill placement
3000
4000
Floodplain Analysis
Le{leno
WS Mnimum Row- Proposed
WS Mnimum Row - Existing
"";'::;:~,,~""""";'~,,,~"",.::~~"Wl.'>l
-Proposed
-Proposed
Ground-~roposed
tleff-Proposed
.
BankSta-Proposed
'"
-ExisUng
Ground-Existing
1
.. !neff_Existing
.
BankSta-Existing
50'00
SlatK:ln(ft)
Figure 24: Existing Inlet Area Cross Section, Existing vs. Proposed Conditions (Station 18865)
~
22
,
April 2009
Springfie!dMill Rac'c Floodplain Analysis
Section206.Project
Table '1: Mill Race HydraDlics under Existing and Proposed Conditions at Gorrie Creek
I DiScharq~' Max Energy I Velocity [. Flow Top
Model Depth Slope Area Width
1 (cfs) (ft) (ftlft) 1 (ftls) 1 (sq ft) (ft)
1 5 2.72 0.000000 1 0.0 112 47
I 20 3.37 0.000002 I 0.1 143 49
'" 50 4.24 0.000006 I 0.3 186 51
c: 1 100 5.00 0.0000141 0.4 226 54
.0
.. 1 200 5.85 0.000033 0.7 273 56
':0
c: 1 300 6.57 0.0000481 1.0 314 59
0
() 1 400 7.19 0.000059 1.1 355 72
OJ
c: 1 500 7.73 0.0000691 . 1.3 397 108
~
'x 1 750 I 8,91 0.000087 1.6 525 . 110
w
1 950 I 9.70 0.000098 I 1.9 613 "111
I 1200 I 10.63 0.0001081 2.1 717 117
1 1500 I' 11.63. 0.000116 1 2.3 , 851 ;; 149 I
5 2.28 0.000001' I 0.1 91 45
20 2.73 0.000005 0.2 112 47
50 3.34 0.000015 1 0.4 141 49
'" 4.09 I 0.000029 1
c: 100 0.6 178 51
0
:E 200 5.20 1 0.000050 1 0.8 237 54
"
c: 300 6.07 1 0.000065 1 1.1 285 57
0
() 400 6.82 1 0.000077 1 1.2 329 63
ti
<D .500 7.47 1 0.000087 I 1.4 376 76
"e- 750 8.75 I 0.000103 I 1.6 508 110
CL
950 I 9.58 1 0.000114 1 1.8 598 :111
1200 I. 10.521 0.0001261 2.0 705 : 115
15001 11.55 0.000130 2.2 839 ::149
-0.44 0.00 0.01 -20.51 "1.37
~0.64 0.00 0.04 -30.80 2.1.98
-0.90 0,00 0.08 -45.16 -2.78
-0.91 0.00 0.12 -47.72 :2.85
c: I -0.65 0.00 0.11 -36.53 -2.15
0
'"
'fij 'I -0.50 'I 0.00 0.09 -29.15 '.1.79
Q. 1 -0.37 I 0.00 I 0.07 -25.20 ,9.27
E
0 I -0.26 I 0,001 0.04 -21.61 -31.76
()
,f ~0.16 1 0.00 I -0.01 -16.98 "0.27
-0.12 I 0.00 I .-0.03 1 -14.38 -0.23
I ,0.11 1 0,00 I -0.071 _12.49 -2.37
1 -0.08 I 0.001 -0.12 I -11.49 0.00
@
23
April 2009
.
Springfield Mill .Race
Section 206 Project
Floodplain Analysis
Table 2: Jasper Slough Confluence Hydraulics under Existing and Proposed Conditions
I Discharge Max Energy Velocity Flow Top
Model Depth Slope Area Width
1 (cfs) (ft) (ftlft) (ftlS) (so ft) (ft)
5 2.47 0.000000 0.0 152 99 I
20 3.12 0.000001 0.1 218 1031
'" 50 4.00 0.000003 0.2 311 1091
c 100 4.77 0.000006 0.3 396 113
0
:~ 200 5:65 0.000011 I 0.4 498 119
'0
c 300 6.38 0.000014 I 0.5 588 124
0
t) 400 7.02 0.000017 0.6 668 129
Ol
c 500 7.59 0.000020 0.7 742 136
ti
'x 750 8.80 0.000024 0.9 I 946 188
w
950 9.62 0.000027 1.0 1102 191
1200 10.57 0.000029 1.11 1284 1941.
1500 11.59 0.000031 1.21 1484 199
5 2.03 0.000001 0.1 109 96
20 2.48 0.000005 0.1 153 99
. 50 3.10 0.000009 0.2 216 103
'" 0.000014
c 100 3.87 0,3 297 108
0
"" 200 5.01 0.000018 0.5 423 115
'6
c 300 5.90 0.000020 0.6 529 121
0
t) 400 6.67 0.000021 0.7 624 126
U
(l) 500 7.34 0.000022 0.7 710 131
'e 750 8.66 0.000026 0.9 920 187 I
D-
950 9.51 0:000028 1.0 1080 191 I
1200 10.47 0.000030 I 1.1 1266 194 I
. 1500, 11.52,0.0000321 1.2 , 1471 , 198 I
1 -0.44 0.000001 0.0 -44 -3
I -0.64 0.000004 0.0 -65 -4
I" -0.90 0.000006 0.1 -95 -6
I -0.900.000008 0.1 -100 -6
c I -0.64 I 0.000007 0.1 -75 -4
0
'"
.C I -0.48 1 0.000006 0.0 -59 -3
'"
a. I -0.35 I 0.000004 0.0 -44 -2
E
0 I -0.251 0.000002 0.0 -33 -5
t)
I -0.14 1 0.000002 0.0 _26 -1
I -0.11 10.000001 0.0 -22 0
I -0.10 I 0.000001 0.0 -18 O.
1 -0.D7 0.000001. 0.0 . -14 -1
@
24
April 2009
,
(
Springfield-Mill Race
Section 206 Project ~
Floodplain Analysis
Table 3: Comparison of 100-year Middle Fork Willamette River hydraulic parameters under Existing
and Proposed Conditions (with changes highlighted)
I Station I I Q Min Ch w:s. 'Vel Flow Top
Plan Total EI Elev ehnl Area Width
1 (It) 1 I (cis) (It) (It) . (ft/sl (SQ It) (It)
I 22433 1 Existinq I 35000 I 478.13 489.59 15.48 2359.59 ,413.87
1 Prooosed I 35000 1 478.13 1 489.59 1 15.48 1 2359.59 413.87
I 20976 I Existinql 35000 I 474.00 1b'!f489'1',4"1' 1'.i'['4~2't~I1!'1'f9Z~8r9':1!l !l:233l1'Z'8'<
Y_.'- ._ '" .l@JJ /'1,_..,'. ii$~_ #'1." .. ., .N)>. .. ., .-. *
. J Prooosed I 35000 1 474.00 1~,489!15ill!!1!!:4~3o;1Jii!I!j;j[t86'!531'JZ33;1i!33:!;
I 20867 I Existinq I 35000 1 469.22 489.00 1 5.47 13452.36 2170.44
1 Prooosed I 35000 I 469.22 489.00 5.47 13452.36 2170.44
I 20753 I Existinq I 35000 I 464.11 488.73 7.12 11067.27 1978.95
I Prooosed I 35000 464.11 488.73 7.12 11067.27 1978.95
I 20650 I Existinq I 35000 464.01 488.37 8.47 8829.35 1763.22
I Prooosed 1 35000 464.01 488.37 8.47 8829.35 1763.22
I 20558 I Existinq I 35000 455.90 488.27 7.68 8575.24 1756.34 "
Proposed I 35000 455.90 488.27 7.68 8575.24 . 1756.34 ,
I 20462 Existinq I 35000 I 461.04 488.01 8.32 7389.43 1706.25
Prooosed I 35000 1 461.04 488.01 8.32 7389.43 1706.25
20373 ExistinQ I 35000 1 468.00 487.49 11.10 7072.58 1593.88
1 Proposed ! 35000 1 468.00 487.49 11.10 7072.58 1593.88
20269 1 Existinq 35000 1 469.55 487.80 7.56 8838.81 1974.65
1 Proposed 1 35000 1 469.55 487.80 7.56 8838.81 1974.65
20165 1 Existinq 1 35000 1 470.00 487.91 7.13 11379.24 2044.67
1 Proposed 1 35000 1 470.00 487.91 7.13 11379.24 2044.67
I 20043 I Existinq 1 35000 I 471.00 487.82 6.29 11214.03 2030.05
I Proposed I 35000 I 471.00 487.82 6.29 11214.03 2030.05
I 19923 Existinq I 35000 472.70 487.76 6.12 110838.86 2028.02
Proposed I 35000 472.70 487.76 6.12 110838.86 1 2028.02
I 19633 Existinq I 35000 473.00 487.78 I 4.51 114953.291 2429.23
Proposed 135000 473.00 487.78 I 4.51 I 14953.29 2429.23
I 19444 Existinq 1 35000 472.00 487.74 I 4.21 115156.30 1 2068.98 1
Proposed 1 35000 472.00 1 487.74 1 4.21 115156.30 2068.98 1
I 19339 Existinq 1 35000 471.17 I 485.85 1 5.78 111044.18 1748.46 I .
Proposed 135000 471.17 I 485.85 1 5.78 111044.18 1748.46 I
I 19224 Existinq 35000 469.56 I 485.76 1 5.88 112161.99 3693.09 I
Proposed 1 35000 469.56 1 485.76 I 5.88 1 12161,991 3693.09 I
I 19100 Existinq 1 35000 468.74 1 485.54 I 6.28 1 8627.85 3629.35 I
1 Proposed I 35000 468.74 1 485.54 I 6.28 1 8627.85 1 3629.35 1
I 18994 1 Existinq' I 35000 469'00 I 485.45 1 6.03 1 8342.82 1 3065.14 I
I Proposed I 35000 469.00 1 485.45 1 6.03 I 8342.82 1 3065.14 1
I I Existinq 1 35000 469.00 i 485.28 I 6.18 I 7601.57 I!l?''''''''''~
18865 ~~rt~3;1i7#0
1 Proposed 1 35000 469.00 1 485.28 I 6.18 1 7601.57 11.1,132160,1
I 18642 I Existinq I 35000 468.00 1 484.99 1 6.76 1 7512.58 I 2976.73 I
1 Proposed I 35000 468.00 1 484.99 1 6.76 I 7512.58 1 2976.73 1
~
25
April 2009
ATTACHMENT E
PLANTING PLAN TABLE
FOR SPRINGFIELD MILL RACE RESTORATION PROJECn - PHASE II
"
"
".
Attachment E - Springfield Mill Race Planting Plan - Phase II
Designation Scientific name Common name Type Size Quantity (per Total I
Spacing
acre) Quantity I
Carex obnupta Slough Sedge Grass Plug 1000 36002' o.c. I
I Downingia elegans Common downingia . Forb Seed 21bs 7.2 N/A I
I EpilobiuF!} densiflorum Dense Spike-Primrose Forb Seed 2 Ibs 7.2 N/A I
IGrindelia integrifolia Gumweed Forb Seed 5 Ibs 18 N/A I
Sea,sonal pondslpa~.icum acuminatum or P. Western Witchgrass Grass Plug 1500 54002' o.C. I
occidentale
IPlagiobolhrys figuralus Popcornflower Forb Seed 2 Ibs 7.2 N/A I
I Rorippa curvisiliqua CUlVed-Pod Yellowcress Forb Seed 2 Ibs 7.2 N/A I
I Sparganium emersum Simple-Stem Bur-Reed Forb Plug 1000 3600 2' o.c. I
Camassia quamash Common Camas Forb Plug 1000 2000 2' o.C. I
ICarex obnupta Slough Sedge Grass Plug 500 1000 2' o.C. I
Emergent IGlyceria accidentalis Western mannagrass Grass Seed 10lbs 20 N/A I
Wetland I Myosotis laxa Small-Flowered Forget-me-not Forb Seed 21bs 41N/A I
IScirpus microcarpus Small-Fruited Bulrush Grass Plug 500 100012' o.C. I
IscriPus tabernaemontanii Soft-Stem Bulrush, Tule Grass Plug 500 100012' o.C. I
Cornus sericea Red-osie~ dogwood Shrub 1 gal 4 2015' o.c. I
I Lonicera lnvolucrata Black twin berry Shrub 1 gal 2 1018' o.c. I
Tree Clumps I Malus fusca Pacific crabapple Tree 1 gal 2 10115' o.C. I
IPhysocarpus capitatus Nine-bark Shrub 1 gal. 3 '15110' o.C. I
IsaliX sitchensis Sitka willow Shrub Cutting 6 30(3' o.C. I
Alnus rubra Red alder Tree 1 gal 30 90120' o.C. I
ICornus sericea Red osier dogwood Shrub 1 gal 250 75018' O.c. I
IFranxinus latifolia Oregon ash Tree 1 gal 30 9020' o.C. I
Scrub-Shrub IPhysocarpus capitatus Nine-bark Shrub I
Wetland 1 gal 250 750 8' o.c.
I Salix lucida Pacific willow Tree Cutting 50 150 6' o.c. I
I Salix sitchensis Sitka willow IShrub Cutting 400 12003' o.c. I
ISPirea douglasii Douglas' spirea IShrub 1 gal 250 750 6' o.C. I
Carex obnupta Slough sedge ISedge Plug 500 1600 2' o.C. I
ICorn.us sericea Red-osier dogwood IShrub 1 gal 50 16015' o.C. i
Ash Forested I Fraxinus latifolia Oregon ash ITree 1 gal 100 320 15' o.C. I
Wetland
I Physocarpus capitatus Nine~bark IShrub 1 gal 50 16015' o.C. I
Symphoricarpos albus S~owberry IShrub 1 gal 100 320 15' o.C. I
Achillea millefolium L. var. Western Yarrow IForb Seed 51bs 9.5 N/A I
occidentalis
IAsclepias speciosa Showy milkweed Forb Seed 2lbs 3.8 N/A I
IBrodiaea elegans Elegant brodiaea Forb Seed 21bs 3.8 N/A I
IClarkia amoena Farewell to spring Forb Seed 21bs 3.8 N/A I
Upland Prairie IDanthomia californica California oatgrass Grass Seed 10lbs 19 N/A I
. IFestuca romerii Romer's fescue Grass Seed 51bs 9.5 N/A I
fFragaria virginiana Broadpetal strawberry Forb Plug 500 950 4' o.c. I
ILupinus polyphyllus Large-leaf lupine Forb 4 in 500 9504' o.C. I
Sidalcea virgata, S. campestris Rose checkermallow, Meadow Forb 4 in 500 9504' o.C. I
sidalcea
Acer circinatum Vine maple Shrub 1 gal 200 4680 8' o.C. I
IAcer macrophyllum Big-leaf maple Tree 1 gal 25 585 20' o.c. I
I Berberis aquifolia Tall Oregon grape Shrub 1 gal 100 2340 8' o.C. I
ICalocedrus decurrens Incense cedar Tree 1 gal 20 468 30' o.c. I
IComus nuttallii Pacific dogwood Tree 1 gal 25 585 15' o.C. I
ICorylus corn uta California hazelnut Tree 1 gal 25 585 15' o.c. I
IPinus Ponderosa Willamette Valley Ponderosa pine Tree 1 gal 10 234 50' o.C. I
Riparian I Polystichum munitum Sword fern Fern 4in 500 11700 2' o.C. I
I Pseudotsuga menziesii Douglas fir Tree 1 gal 40 93620' o.c. I
I Rosa nutkana Nootka rose Shrub 1 gal 200 4680 8' o.C. I
I Rosa pisocarpa Cluster flowered rose Shrub 1 gal 200 4680 8' o.C. I
I Rubus parviflora Thimbleberry Shrub 1 gal 200 4680 8' o.C. I
I Salix lucid a Pacific willow Shrub Cutting 1000 234002'.0.c. I
I Salix sitchensis Sitka willow Shrub Cutting 1000 23400 2' o.C. I
I Symphoricarpos albus Snowberry Shrub 1 gal 200 4680 8' o.C. I
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