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What follows is a list of the fourteen reservoirs in the state of Washington , the United States, that contain at least 250,000 acre feet when at full capacity. In addition to in-stream reservoirs, the list includes enhanced natural lakes, such as Lake Chelan .
Key
† denotes reservoir not entirely in Washington
List
Name
County(s)
Coordinates
Volume[n 1] (acre feet)
Volume (km3 )
Surface area [n 2]
Elevation[n 3]
Inflow
Dam
Image
Franklin D. Roosevelt Lake
Ferry , Stevens , Lincoln , Okanogan ,Grant
9,562,000
11.7945
82,300
1,290[1]
Columbia River
Grand Coulee Dam
Lake Umatilla
Multnomah †, Hood River †, Wasco †, Skamania , Klickitat
2,530,000
3.1207
52,000
268[2]
Columbia River
John Day Dam
Riffe Lake
Lewis
1,790,000
2.2079
11,830
778[3]
Cowlitz River
Mossyrock Dam
Ross Lake
Whatcom
1,452,750
1.7920
11,678
1,602[4]
Skagit River
Ross Dam
Lake Wallula
Benton , Franklin , Walla Walla , Umatilla †
1,350,000
1.6652
38,000
357[5]
Columbia River
McNary Dam
Banks Lake
Grant , Douglas
1,275,000
1.5727
27,000
1,570[6]
Columbia Basin Project
Dry Falls Dam
Lake Chelan [n 4]
Chelan
1,059,350
1.3067
33,000
1,100[7]
Stehekin River
Lake Chelan Dam
Lake Wanapum
Kittitas , Grant , Douglas , Chelan
796,000
0.9819
14,720
Columbia River
Wanapum Dam
Swift Reservoir
Skamania
756,000
0.9325
4,620
1,012[8]
Lewis River
Swift Dam
Lake Bryan
Columbia , Whitman
565,200
0.6972
10,025
Columbia River
Little Goose Dam
Lake Bonneville
Multnomah †, Hood River †
537,000
0.6624
20,200
Columbia River
Bonneville Dam
Lower Granite Lake
Garfield , Whitman
485,000
0.5982
8,900
Snake River
Lower Granite Dam
Lake Cushman
Mason
473,400
0.5839
4,010
North Fork Skokomish River
Cushman Dam No. 1
Lake Washington
King
458,000
0.5650
25,000
Sammamish River
Hiram M. Chittenden Locks
Rock Island Pool
Chelan , Douglas
131,000
0.1616
3,320
Columbia River
Chief Joseph Dam
See also
Notes
^ When available, volume given is the maximum flood pool, not the operational or live storage capacity.
^ Surface area given in acres.
^ Elevation given is the elevation of reservoir at full pool, measured in feet.
^ Natural lake raised by dam.
References
Jurisdictions Canyons Natural features Tributaries Engineering
Designated areas Related topics