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