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Hydro Power: Cushman Hydro Project: STATISTICS
 
 

Cushman Hydro Project LogoCushman Hydro Project Statistics

 

  Cushman No. 1 Cushman No. 2
Year completed 1925 1930
River System North Fork, Skokomish River North Fork, Skokomish River
Original Investment $4.36 million $8.23 million
Type of dam Concrete arch/gravity & embankment Concrete arch/gravity
Height: above riverbed above bedrock 235 feet
275 feet
175 feet
235 feet
Length 1,111 feet 575 feet
Width:
top base
8 feet
50 feet
8 feet
40 feet
Volume of concrete in dam 90,000 cubic yards 38,000 cubic yards
Average flow 845 cubic feet/second 852 cubic feet/second
Drainage area 94 square miles 100 square miles
Reservoir length 9.6 miles 2 miles
Miles of shoreline 23 miles 4.5 miles
Reservoir area at maximum elevation 4,010 acres 150 acres
Reservoir elevation: full
lowest allowable
738 feet
615 feet
480 feet
460 feet
Average annual generation 127 million kilowatt-hours 233 million kilowatt-hours
Equivalent number of Northwest homes served 9,000 16,500
Number of generators Two — 21,600 kilowatt Three — 27,000 kilowatt
Installed capacity (nameplate rating) 43,200 kilowatts 81,000 kilowatts

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