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Major dams and reservoirs on the lower
Snake and Columbia rivers
Lower Granite Dam/Lower Granite Lake
Length of dam: 3,200 feet
Reservoir capacity: 483,800 acre-feet*
Reservoir length: 39 miles
Hydroelectric generating capacity: 810,000 kilowatts**
Little Goose Dam/Lake Bryant
Length of dam: 2,655 feet
Reservoir capacity: 565,200 acre-feet
Reservoir length: 37 miles
Hydroelectric generating capacity: 810,000 kilowatts
Lower Monumental Dam/Lake Herbert G. West
Length of dam: 3,791 feet
Reservoir capacity: 20,000 acre-feet
Reservoir length: 28 miles
Hydroelectric generating capacity: 810,000 kilowatts
Ice Harbor Dam/Lake Sacajawea
Length of dam: 2,822 feet
Reservoir capacity: 24,900 acre-feet
Reservoir length: 32 miles
Hydroelectric generating capacity: 603,000 kilowatts
McNary Dam/Lake Wallula
Length of dam: 7,300 feet
Reservoir capacity: 185,000 acre-feet
Reservoir length: 62 miles
Hydroelectric generating capacity: 980,000 kilowatts
John Day Dam/Lake Umatilla
Length of dam: 5,640 feet
Reservoir capacity: 534,000 acre-feet
Reservoir length: 76 miles
Hydroelectric generating capacity: 2.2 million kilowatts
The Dalles Dam/Lake Celilo
Length of dam: 8,875 feet
Reservoir capacity: 311,000 acre-feet
Reservoir length: 24 miles
Hydroelectric generating capacity: 1.8 million kilowatts
Bonneville Dam/Lake Bonneville
Length of dam: 2,690 feet
Reservoir capacity: 761,000 acre-feet
Reservoir length: 48 miles
Hydroelectric generating capacity: 1.1 million kilowatts
* All the lower Columbia and Snake River dams are
"run of the river" dams, meaning they rely on incoming river
flows to generate electricity and have extremely limited ability
to store water.
** A kilowatt equals 1,000 watts, and is roughly the
generating capacity required to power one average home.
Source: U.S. Army Corps of Engineers |
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