Hydroelectric Information for Columbia and Snake River Projects

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Rock Island Dam - General Information

Dam: Rock Island Dam. Columbia River. River Mile 453.4

Constructed ¹: 1933, 6 additional units completed 1953, Second Powerhouse completed 1979

Owner: Chelan County PUD No. 1

Normal Full Pool: 613.0 feet

Normal Minimum Pool: 609.0 feet

Powerhouse Capacity ¹:

First Powerhouse Nameplate capacity: 3 @ 20.7 MW, 1 @ 15 MW, 6 @ 22.5, 212 MW total

Second Powerhouse Nameplate capacity: 8 @ 51.3 MW, 410.4 MW total

Total Nameplate capacity: 622.5 MW total

Peak capacity: 660 MW total

Spillway ¹: 31 gates (14 east, 17 west)

• Chelan County PUD for detailed information and history.