List of dams and reservoirs in Washington

Chief Joseph Dam

This is a list of dams and reservoirs in the U.S. state of Washington, and pertinent data. According to the Washington State Department of Ecology, there are 1166 dams in the state. King County has 124 dams, almost twice as much as any other.[1]

The largest dam in Washington, in terms of structural volume, reservoir capacity and electricity production, is the Grand Coulee Dam on the Columbia River. The tallest dam is Mossyrock Dam on the Cowlitz River, at 606 feet (185 m). The longest dam is O'Sullivan Dam on Crab Creek, at 19,000 feet (5,800 m).

List

Key
dagger Located on state border with Oregon
Dam County Owner Year Type Height Reservoir Reservoir
capacity		 Installed
capacity
(MW)		 River Primary
purpose(s)
ft m acre.ft dam3
Alder Dam Pierce/
Thurston		 Tacoma Power 1945 Arch 330 100 Alder Lake 241,950 298,440 50.0 Nisqually River Hydroelectric
Bonneville Dam† Skamania U.S. Army Corps of Engineers 1937 Gravity 197 60 Lake Bonneville 537,000 662,000 1,242.0 Columbia River Hydroelectric,
Navigation
Boundary Dam Pend Oreille Seattle City Light 1967 Arch-gravity 340 100 Boundary Lake 95,000 117,000 1,070.0 Pend Oreille River Hydroelectric
Box Canyon Dam Pend Oreille Pend Oreille Public Utility District 1956 Gravity 62 19 Box Canyon Reservoir 60,000 74,000 90.0 Pend Oreille River Hydroelectric
Chief Joseph Dam Douglas/
Okanogan		 U.S. Army Corps of Engineers 1979 Gravity 135 41 Rock Island Pool 516,000 636,000 2,620.0 Columbia River Hydroelectric
Cle Elum Dam Kittitas U.S. Bureau of Reclamation 1933 Earthfill 165 50 Cle Elum Lake[n 1] 436,900 538,900 Cle Elum River Irrigation
Culmback Dam Snohomish City of Everett, Snohomish County PUD 1965 Rockfill 262 80 Spada Lake 165,774 204,479 112.0 Sultan River Water supply
Cushman Dam No. 1 Mason Tacoma Power 1926 Arch 235 72 Lake Cushman 453,400 559,300 43.2 North Fork Skokomish River Hydroelectric
Cushman Dam No. 2 Mason Tacoma Power 1930 Arch 175 53 Lake Kokanee 8,000 9,900 81.0 North Fork Skokomish River Hydroelectric
Diablo Dam Whatcom Seattle City Light 1930 Arch 389 119 Diablo Lake 88,500 109,200 129.0 Skagit River Hydroelectric
Dry Falls Dam[n 2] Grant U.S. Bureau of Reclamation 1949 Earthfill 123 37 Banks Lake 1,275,000 1,573,000 Grand Coulee Irrigation
Gorge Dam Whatcom Seattle City Light 1961 Gravity 300 91 Gorge Lake 9,700 12,000 199.2 Skagit River Hydroelectric
Grand Coulee Dam Grant/
Okanogan		 U.S. Bureau of Reclamation 1942 Gravity 550 170 Franklin Delano Roosevelt Lake 9,562,000 11,795,000 6,809.0 Columbia River Irrigation,
Hydroelectric,
Flood control
Hiram M. Chittenden Locks and Dam King U.S. Army Corps of Engineers 1916 Gravity 26 7.9 Lake Washington[n 3] 458,000 565,000 0 Lake Washington Ship Canal Navigation
Howard A. Hanson Dam King U.S. Army Corps of Engineers 1961 Earthfill 235 72 Howard A. Hanson Reservoir 136,700 168,600 Green River Flood control,
Water supply
John Day Dam† Klickitat U.S. Army Corps of Engineers 1971 Gravity 184 56 Lake Umatilla 2,530,000 3,120,000 2,160.0 Columbia River Hydroelectric,
Navigation
Ice Harbor Dam Franklin/
Walla Walla		 U.S. Army Corps of Engineers 1962 Gravity 100 30 Lake Sacajawea 249,000 307,000 603.0 Snake River Hydroelectric,
Navigation
Kachess Dam Kittitas U.S. Bureau of Reclamation 1912 Earthfill 112 34 Kachess Lake[n 4] 239,000 295,000 Kachess River Irrigation
Keechelus Dam Kittitas U.S. Bureau of Reclamation 1917 Earthfill 128 39 Keechelus Lake[n 5] 157,900 194,800 Yakima River Irrigation
LaGrande Dam Pierce/
Thurston		 Tacoma Power 1945 Gravity 192 59 LaGrande Reservoir 2,700 3,300 65.0 Nisqually River Hydroelectric
Lake Chelan Dam Chelan Chelan County Public Utility District 1927 Gravity 40 12 Lake Chelan[n 6] 677,400 835,600 59.2 Chelan River Hydroelectric
Lake Tapps (Multiple dikes) Pierce Cascade Water Alliance 1911 Earthfill Lake Tapps 48,258 59,525 Off-stream Recreation,
Water supply (proposed)
Little Goose Dam Columbia/
Whitman		 U.S. Army Corps of Engineers 1970 Gravity 96 29 Lake Bryan 516,300 636,800 810.0 Snake River Hydroelectric,
Navigation
Long Lake Dam Lincoln/
Stevens		 Avista 1915 Gravity 213 65 Long Lake 105,000 130,000 71.0 Spokane River Hydroelectric
Lower Baker Dam Skagit Puget Sound Energy 1925 Arch 285 87 Lake Shannon 161,470 199,170 79.0 Baker River Hydroelectric
Lower Granite Dam Garfield/
Whitman		 U.S. Army Corps of Engineers 1975 Gravity 100 30 Lower Granite Lake 440,200 543,000 810.0 Snake River Hydroelectric,
Navigation
Lower Monumental Dam Franklin/
Walla Walla		 U.S. Army Corps of Engineers 1969 Gravity 100 30 Lake Herbert G. West 432,000 533,000 810.0 Snake River Hydroelectric,
Navigation
Masonry Dam King Seattle Public Utilities 1915 Arch-gravity 215 66 Chester Morse Lake/
Masonry Pool[n 7]		 93,900 115,800 30.0 Cedar River Water supply,
Hydroelectric
Mayfield Dam Lewis Tacoma Power 1963 Arch-gravity 250 76 Lake Mayfield 133,764 164,995 162.0 Cowlitz River Hydroelectric
McNary Dam† Benton U.S. Army Corps of Engineers 1954 Gravity 183 56 Lake Wallula 1,350,000 1,670,000 986.0 Columbia River Hydroelectric,
Navigation
Merwin Dam Clark/
Cowlitz		 PacifiCorp 1931 Arch-gravity 313 95 Lake Merwin 422,000 521,000 136.0 Lewis River Hydroelectric
Mossyrock Dam Lewis Tacoma Power 1968 Arch 606 185 Riffe Lake 1,685,000 2,078,000 300.0 Cowlitz River Hydroelectric
Mud Mountain Dam King U.S. Army Corps of Engineers 1948 Earth/rockfill 432 132 Mud Mountain Lake 106,000 131,000 0 White River Flood control
Pinto Dam Grant U.S. Bureau of Reclamation 1948 Earthfill 130 40 Billy Clapp Lake 21,200 26,100 Off-stream Irrigation
Priest Rapids Dam Grant/
Yakima		 Grant County Public Utility District 1961 Gravity/
Embankment		 178 54 Priest Rapids Lake 237,100 292,500 955.6 Columbia River Hydroelectric
Rock Island Dam Chelan/
Douglas		 Chelan County Public Utility District 1933 Gravity 135 41 Rock Island Pool 131,000 162,000 623.7 Columbia River Hydroelectric
Rocky Reach Dam Chelan/
Douglas		 Chelan County Public Utility District 1969 Gravity 130 40 Lake Entiat 382,000 471,000 1,299.6 Columbia River Hydroelectric
Ross Dam Whatcom Seattle City Light 1949 Arch 540 160 Ross Lake 1,435,000 1,770,000 460.0 Skagit River Hydroelectric
Skookumchuck Dam Thurston TransAlta 1970 Earthfill 190 58 Skookumchuck Reservoir 34,800 42,900 1.0 Skookumchuck River Water supply
South Fork Tolt River Dam King Seattle Public Utilities 1964 Earthfill 200 61 South Fork Tolt Reservoir 57,900 71,400 6.55 South Fork Tolt River Water supply
Swift Dam Skamania PacifiCorp 1958 Earthfill 512 156 Swift Reservoir 755,600 932,000 240.0 Lewis River Hydroelectric
The Dalles Dam† Klickitat U.S. Army Corps of Engineers 1957 Gravity 200 61 Lake Celilo 330,000 410,000 1,878.3 Columbia River Hydroelectric,
navigation
Tieton Dam Yakima U.S. Bureau of Reclamation 1925 Earthfill 319 97 Rimrock Lake 203,600 251,100 15.6 Tieton River Irrigation
Toutle River Sediment Retention Structure Cowlitz U.S. Army Corps of Engineers 1989 Earthfill 184 56 [n 8] 160,000 200,000 0 North Fork Toutle River Sediment control
Upper Baker Dam Whatcom Puget Sound Energy 1959 Arch 312 95 Baker Lake 285,000 352,000 91.0 Baker River Hydroelectric
Wanapum Dam Grant/
Kittitas		 Grant County Public Utility District 1963 Gravity/
Embankment		 185 56 Lake Wanapum 796,000 982,000 1,040.0 Columbia River Hydroelectric
Wells Dam Chelan/
Douglas		 Douglas County Public Utility District 1967 Gravity 160 49 Lake Pateros 331,200 408,500 851.4 Columbia River Hydroelectric
Wynoochee Dam Grays Harbor City of Aberdeen 1972 Gravity 175 53 Wynoochee Lake 69,405 85,610 10.8 Wynoochee River Water supply
Yale Dam Clark/
Cowlitz		 PacifiCorp 1953 Earthfill 323 98 Yale Lake 402,000 496,000 134.0 Lewis River Hydroelectric

Removed dams

See also

Notes

  1. ↑ Natural lake raised by dam.
  2. ↑ Holds Banks Lake along with the smaller North Dam.
  3. ↑ Natural lake with its ocean outlet re-routed via the ship canal. The lock and dam structure maintains the lake level.
  4. ↑ Natural lake raised by dam.
  5. ↑ Natural lake raised by dam.
  6. ↑ Natural lake raised by dam.
  7. ↑ Chester Morse Lake is a natural lake enlarged by the Chester Morse Dam in 1900. When Masonry Dam was constructed in 1915 it submerged the old dam and created a new body of water, just downstream and connected to Chester Morse Lake, called Masonry Pool.
  8. ↑ The Sediment Retention Structure was constructed to trap debris flow sediment after the 1980 eruption of Mount St. Helens. The basin behind the dam is almost entirely filled with silt.

References

  1. ↑ https://fortress.wa.gov/ecy/publications/documents/94016.pdf
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