Corps No. NWP-2014-469 Page 1 of 5 Enclosure

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Corps N

o. NW

P-2014-469

Page 2 of 5

Enclosure

POINT# NORTHING EASTING ELEVATION

331554_39 4212049.93 setrdg

331430.11 421215630 1149.78 setrdg

33143757 4212105.66 115431 setrdg

NOTE INFORMAT,ON IS NOT A LAND SURVEY AND IS PRIMARILY A TOPOGRAPHIC ANALYSIS FO.~ RESTORATION DESIGN PURPOSES

COORDINATE SYSTEM· OREGONSTA:-E PLANE SOUTH HORIZ ~ATUM· NAD83 (2011) VERT DA:-UM"I\AVD66 (GEOID 12A) UNITS: U.S SURVEY FEET

STREAM REACH CHARACTERISTICS DRAINAGE AREA 149 SQ. MILES AVERAGE REACH SLOPE ---0.0135 FT/FT ACTIVE CHANNEL WIDTH ---25 - 35 FT 2-YEAR FLOW 6,250 cfs 10-YEARFLOW 11,600cfs 25-YEAR FLOW 14,300 cfs 50-YEAR FLOW 16,400 cfs 100-YEAR FLOW 16,400 cfs INWATERWORKPERIOO ---JUNE 15TH -SEPT 15TH

0 EXISTING SITE LAYOUT 1" -100'

ESTIMATED STORED SEDIMENT A PORTION OF THE SEDIMENT WITHIN THE RESERVOIR WILL MOBILIZE ONCE THE DAM IS REMOVED THE EXISTING RIVER CHANNEL WIDTH RANGES BETWEEN 25FT AND 35FT. MOBILE SEDIMENT VOLUME It\ THE RESERVOIR WAS DETERMINED BY ESTIMATING THE SLOPE OF THE RIVER AFTER DAM RE~OVAL AND USING A TYPICAL CHANNEL SECTION THOUGH THE RESERVOIR AREA AT TdE ESTIMATED SLOPE. THE MOBILE SEDIMENT VOLUME IS EST:MATED AT 3,000 CUBIC YARDS

WIMER DAM CHARACTERISTICS CONCRETE BUTTRESS CONSTRUCTION - LENGTH OF CREST -93 FT -HEIGHT OF DAM 18FT-23FT -CONCRETE VOLUME -400 CY

1160 f"'>--------------------------------REACHSLO?Ec±G.0068FT/FT-------------------------~'<J•

~:g-----------------c-::-======c-_RESERVOIR LENGTH:!:S86FT ------------------------1 WATER SURFACE 11113113)" SLOPE =t00C09 < ~

WATER SL'RFACE 11/13/13

WIMER DAM HB CFS) \1 CREST ELEV=±1147 9FT 1150

-.t;:::~r----- -.......__ ---- . -- ----- --..Ji (-1SCFSJ - -- --~-~ ----\J~ -- ,__ ,-

1140

1130

HEAD OF RESERVO:R. EXPOSED BEDROCK SURFACE

\. _ '"""~--- _./\ '- ../ /-- \_EXISTING THALWEG ......_ .......... _ \r-L--::::-::-::::-:;::-----;:::-::::-:::f==ol-__,.-c-=~-___j ;I;;;N:-RIFFLE I I I

I I \ / /

GRADE CONTROL ~

1120+---~----,---~----,---~-----.----L----,----L----,----L----,----L----,----L----.----~--------~--------~--------~--------~---,-----L----+

1160

1150

1140

1130

1120 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+00 13+00 14+00 15+00 16+00

fi\1-'EX=::IS::.cT,_,I"-'N,_,G,_,L"'O"-'N,_,G,_,_P-"R~O~F~I~L;:;;:E~~ ~ 7oRIZ1"=100'

VERT 1" = 20'

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Corps N

o. NW

P-2014-469

Page 3 of 5

Enclosure

f.j1 DAM REMOVAL PHASJN,g_LAYOE \.V 1"=30'

PROPOSED PROJECT PHASING PHASE 1

1.1 INSTALL TRAFFIC SAFETY FEATURES IN ACCORDANCE WITH DRAWING 21.

1.2 MOBILIZE CONSTRUCTION EQUIPMENT AND FACILITIES ON SITE

1.3 CONSTRUCT TEMPORARY ROAD NETWORK TO PROVIDE SITE ACCESS TO THE EXISTING DAM PER DRAWIJ\G 2.1.

1 5 INSTALL TEMPORARY C"JLVERT CROSSING FOR ACCESS TO DAM STRUCTURE

1 6 INSTAll TEMPORARY SAND BAGS/BULK BAGS UPSTREAM AND DOWNSTREAM OF DAM TO TEMPORARILY DIVERT SlREAM FLOW DOWN EXISTING FISH LADDER AND :SOLATE CONCRETE STRUCTURE FOR REMOVAL

1.7 PERFORM FISH SALVAGE IN ISOLATED AREA.

1.8 CONTRACTOR TO PROTECT AND RELOCATE WATER INTAKE PIPE IF NECESSARY ~a PROVIDE LANDOWNER W:TH CONTINUOUS ACCESS TO WATER. FINAL LOCATION POST DAM REMOVAL TO BE PER DRAWIJ\G 3.4

1.9 REMOVE WEIR PORTION OF DAM BEGINNING AT THE RIVER ~FT EDGE OF STRUCTURE AND MOV:NG TOWARDS THE CENTER OF THE CHANNEL CONCRETE RUBBLE TO BE HAJLED OFFSITE TO APP~OVED DISPOSAL LOCATION, APPROXIMATELY :t370 CUBIC YARDS OF CONCRETE

1.10 GRADE FISH PASSAGE CHANNEL THROUGH DAM SITE PER DRAWING 3 5 AND 3.6 (:t1000 CY). USE EXCAVATED MATERIAL TO FILL DOWNSTREAM SCOUR POOL

1.11 ACTIVATE FISH PASSAGE CHANNEL BY REMOVING PHASE 1 SAND BAGS/BULK BAGS.

1.12 REMOVE PHASE 1 WORK AREA ISOLATION MEASURES.

PHASE2 21 ACCESS FISH LADDER AND REMAINING CONCRETE STRUCTURES BY M~S OF

TE.'vlPORARY CULVERT AND ACCESS ROAD USED IN PHASE 1

22 lt-;STALL TEMPORARY FLOATING SILT CURTAIN DOWNSTREAM OF THE WORK ZONE TO RETAIN ANY SUSPENDED SEDIMENT FROM REMOVAL ACTIVITIES.

2 3 INSTALL TEMPORARY SAND BAGS/BULK BAGS UPSTREAM OF FISH LADDER TO ISOLATE WORK AREA IF NECESSARY

24 REMOVE FISH LADDER STRUCTURE AND ANY REMANJING CONCRETE STRUCTURES. ALL RUBBLE TO BE HAULED OFFSITE TO APPROVED DISPOSAL LOCATION. APPROXIMATELY :t30 CUSIC YAROS CONCRETE.

COMPLETE UPSTREAM GRADING OF FISH PASSAGE CHANNEL :F NECESSARY.

2 6 PERFORM STREAW. RESTORATION ACTIVITIES.

2.7 RE~.OVE PROJECT ISOLATION MEASURES AND TEMPORARY CULVERT

FENCE

sz WS11113/13 15

'--liA-cRESTELEV=±1147.9' ]·'

I ~ ····;·· . . •i .. \ II~ INS11113113

:- k "\ • LOW SUMMER APPROXIMATE ·- . - :1 · • FLOW

STORED SEDIMENT .> ; • .. \ frTOEELEV=±1126.1'

APPROXIMATE SHAPE- . L __:_ Y-..-----OF CONCRETE DAM !--9'~

0 WIMER DAM SECTI~ = HORIZ 1"- 20' VERT 1" o 20'

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Corps No. NWP-2014-469Page 4 of 5Enclosure

DIVERSION INTAKE RELOCATION NO. DATE BY DESCRIPTION CHJ<

' 10131114 RB ISSUED FOR PERMITS SW

1--t-f-----+------+---1 DECONSTRUCTION, FISH PASSAGE, AND RESTORATION

EVANS CREEK- WIMER, OREGON

...t._ RIVER ~DESIGN

·-,:-.~.-_-" GROUP. 1r--1c

236 W.stonslo Avenue 31 1 SW Jeffer~on Avenue \l,\,itef<5h,MTS9937 C~rvliKs OR97333 4068824927 541.7JS292C

Corps N

o. NW

P-2014-469

Page 5 of 5

Enclosure

___ ,/ __ _ ----------------

10+00

CD PROPOSED FISH PASSAGE CH~NEL 1"- 50'

11+00

PROPOSED STREAM FLOWLINE _) F:JR F:SH PASSAGE :t2.6% SLOPE

12+00

0 FISH PASSAGE LONGITUDINA,!:!ROFI!5 HORIZ 1" =50' VERT 1" = 25'

14+00

~ISSUED FO