Dams in Washington

817 damsAvg age: 55 years

405

High Hazard

Significant

311

Low Hazard

Dam Safety in Washington

Washington has 817 dams tracked in the National Inventory of Dams. Of these, 405 (49%) are classified as high hazard — meaning failure would probably cause loss of human life — and 98 are classified as significant hazard. Currently, 68 dams in the state have a condition assessment of poor or unsatisfactory, indicating recognized safety deficiencies.

The average dam in Washington is 55 years old. The most common purpose for dams in Washington is irrigation, accounting for 187 of the state's dams.

The federal inventory is not every dam in Washington. It includes dams rated high or significant hazard, plus low-hazard dams above a size threshold (taller than 25 feet holding more than 15 acre-feet, or taller than 6 feet holding more than 50 acre-feet). Small, older dams below that line are usually left out, even though they can still shape the streams around them. The state's own dam safety program often tracks many more, and it is the agency that inspects most of them.

Use the search above to find dams near any address in Washington, or browse by county below. Each dam listing includes its hazard potential classification, condition assessment, physical characteristics, and inspection history from the NID.

Washington Dam Facts

Total Dams	817
High Hazard Dams	405
Average Dam Age	55 years
Tallest Dam	606 ft
Largest Reservoir	9,715,346 acre-ft
Poor/Unsatisfactory Condition	68

Notable Dams in Washington

Mossyrock606 ftHigh Grand Coulee Dam550 ftHigh Ross540 ftHigh MUD Mountain Dam425 ftHigh Swift No. 1412 ftHigh

Explore Washington Dams

Oldest DamsEarliest dams in Washington Tallest DamsHighest dams in Washington

Counties in Washington

Adams18 dams5 high hazard Benton28 dams11 high hazard Chelan37 dams32 high hazard Clallam8 dams6 high hazard Clark18 dams6 high hazard Columbia2 dams1 high hazard Cowlitz15 dams5 high hazard Douglas15 dams4 high hazard Ferry8 dams3 high hazard Franklin27 dams5 high hazard Garfield1 dams Grant44 dams13 high hazard Grays Harbor14 dams9 high hazard Island8 dams3 high hazard Jefferson4 dams3 high hazard King92 dams62 high hazard Kitsap18 dams10 high hazard Kittitas10 dams5 high hazard Klickitat7 dams1 high hazard Lewis34 dams9 high hazard Lincoln9 dams6 high hazard Mason16 dams8 high hazard Nez Perce1 dams1 high hazard Okanogan33 dams20 high hazard Pacific4 dams1 high hazard Pend Oreille27 dams11 high hazard Pierce35 dams24 high hazard San Juan37 dams9 high hazard Skagit23 dams12 high hazard Skamania6 dams2 high hazard Snohomish42 dams21 high hazard Spokane28 dams10 high hazard Stevens35 dams15 high hazard Thurston17 dams7 high hazard Walla Walla13 dams6 high hazard Whatcom30 dams22 high hazard Whitman3 dams1 high hazard Yakima50 dams36 high hazard

High Hazard Dams in Washington

Dam	County	Height	Condition	Purpose
Mossyrock	Lewis	606 ft	Unsatisfactory	Hydroelectric
Grand Coulee Dam	Okanogan	550 ft	Not assessed	Flood Risk Reduction
Ross	Whatcom	540 ft	Satisfactory	Hydroelectric
MUD Mountain Dam	King	425 ft	Not assessed	Flood Risk Reduction
Swift No. 1	Skamania	412 ft	Fair	Hydroelectric
Diablo	Whatcom	389 ft	Satisfactory	Hydroelectric
Boundary	Pend Oreille	360 ft	Fair	Hydroelectric
Asamera Cannon Mine Tailings Dam	Chelan	340 ft	Satisfactory	Flood Risk Reduction
Alder	Pierce	330 ft	Satisfactory	Hydroelectric
Yale	Cowlitz	323 ft	Fair	Hydroelectric
Tieton Dam	Yakima	319 ft	Not assessed	Flood Risk Reduction
Merwin	Cowlitz	313 ft	Fair	Hydroelectric
Gorge	Whatcom	300 ft	Satisfactory	Hydroelectric
Lower Baker	Skagit	285 ft	Poor	Hydroelectric
Cushman No 2	Mason	275 ft	Satisfactory	Hydroelectric
Cushman No 1	Mason	272 ft	Fair	Hydroelectric
Culmback	Snohomish	262 ft	Satisfactory	Hydroelectric
Mayfield	Lewis	250 ft	Unsatisfactory	Hydroelectric
Mount St. Helens Sediment Retention Structure	Cowlitz	239 ft	Not assessed	Flood Risk Reduction
Howard A. Hanson Dam	King	235 ft	Not assessed	Flood Risk Reduction
Masonry Dam	King	230 ft	Satisfactory	Hydroelectric
Chief Joseph Dam	Douglas	230 ft	Not assessed	Hydroelectric
Little Goose Lock and Dam	Columbia	226 ft	Not assessed	Navigation
Lower Monumental Lock and Dam	Franklin	226 ft	Not assessed	Navigation
Long Lake	Stevens	225 ft	Fair	Hydroelectric
La Grande	Thurston	217 ft	Satisfactory	Hydroelectric
Ice Harbor Lock and Dam	Walla Walla	208 ft	Not assessed	Navigation
Wanapum	Kittitas	206 ft	Fair	Hydroelectric
O'sullivan Dam	Grant	200 ft	Not assessed	Flood Risk Reduction
Tolt River - South Fork	King	200 ft	Fair	Water Supply
Casad Dam	Kitsap	190 ft	Fair	Water Supply
Kinross Gold Kettle River Tailings Dam	Ferry	189 ft	Satisfactory	Tailings
Priest Rapids	Grant	187 ft	Fair	Hydroelectric
Wynoochee	Grays Harbor	175 ft	Satisfactory	Water Supply
Skookumchuck	Thurston	160 ft	Satisfactory	Hydroelectric
Wells	Chelan	160 ft	Poor	Hydroelectric
North Dam	Grant	145 ft	Not assessed	Flood Risk Reduction
Mill Creek Storage Dam	Walla Walla	145 ft	Not assessed	Flood Risk Reduction
Icon Materials Pond 4	King	140 ft	Fair	Water Supply
Pinto Dam	Grant	130 ft	Not assessed	Flood Risk Reduction
Rocky Reach	Chelan	130 ft	Satisfactory	Hydroelectric
Keechelus Dam	Kittitas	128 ft	Not assessed	Flood Risk Reduction
Zintel Canyon Dam	Benton	125 ft	Satisfactory	Flood Risk Reduction
Dry Falls Dam	Grant	123 ft	Not assessed	Flood Risk Reduction
Kachess Dam	Kittitas	115 ft	Not assessed	Flood Risk Reduction
Wenas Dam	Yakima	90 ft	Fair	Irrigation
Nine Mile	Spokane	87 ft	Satisfactory	Hydroelectric
Clear Creek Dam	Yakima	84 ft	Not assessed	Fish and Wildlife Pond
Judy Reservoir Dam B	Skagit	80 ft	Fair	Water Supply
Roza Ww5 Reregulation Reservoir	Yakima	76 ft	Satisfactory	Irrigation
Chaplain Lake South Dam	Snohomish	75 ft	Satisfactory	Water Supply
French Canyon Dam	Yakima	74 ft	Not assessed	Irrigation
Indian Creek Dam	Pacific	73 ft	Poor	Water Supply
Conconully Dam	Okanogan	72 ft	Not assessed	Irrigation
Rock Island	Douglas	71 ft	Satisfactory	Hydroelectric
Fanchers Dam	Okanogan	68 ft	Fair	Irrigation
Easton Diversion Dam	Kittitas	66 ft	Not assessed	Irrigation
Upper Wheeler Dam	Chelan	65 ft	Fair	Irrigation
Stemilt Main Dam	Chelan	65 ft	Fair	Irrigation
Little Falls Dam	Stevens	64 ft	Fair	Hydroelectric
Hiram M. Chittenden Locks and Dam	King	63 ft	Not assessed	Navigation
Antilon Lake Dam	Chelan	62 ft	Fair	Recreation
Leader Lake Dam	Okanogan	61 ft	Satisfactory	Irrigation
Judy Reservoir Dam a	Skagit	61 ft	Fair	Water Supply
Bumping Lake Dam	Yakima	61 ft	Not assessed	Flood Risk Reduction
Ponderosa Lake Dam	Stevens	60 ft	Poor	Recreation
Power Lake Dam	Pend Oreille	60 ft	Fair	Hydroelectric
Newcastle Railroad Embankment Dam	King	55 ft	Poor	Flood Risk Reduction
Salmon Lake Dam	Okanogan	54 ft	Not assessed	Irrigation
Boeing Creek Park North Pond Dam	King	54 ft	Satisfactory	Flood Risk Reduction
Tyson Fresh Meats Storage Pond 4	Walla Walla	52 ft	Satisfactory	Other
Malinowski Dam	Grays Harbor	51 ft	Satisfactory	Water Supply
Evans Flavorland Reservoir No 1	Yakima	50 ft	Satisfactory	Irrigation
Tapps Lake Dike No 4	Pierce	48 ft	Satisfactory	Recreation
Boeing Flood Control Dam	Snohomish	48 ft	Satisfactory	Flood Risk Reduction
Upper Loop Reservoir	Chelan	47 ft	Satisfactory	Irrigation
Tuck Lake Dam	King	47 ft	Fair	Recreation
Horseshoe Lake Dam	Stevens	45 ft	Satisfactory	Fish and Wildlife Pond
Mccain Foods Process Water Storage Facil	Adams	44 ft	Not assessed	Other
Sunnyside Mp 59.29 Reservoir	Benton	44 ft	Fair	Irrigation
Sunnyside Mp 23.7 Reservoir	Yakima	43 ft	Satisfactory	Irrigation
Lords Lake North Dam	Jefferson	42 ft	Satisfactory	Water Supply
Lords Lake East Dam	Jefferson	42 ft	Poor	Water Supply
Mountain Pond Dam	Walla Walla	42 ft	Fair	Irrigation
Margaret Lake Dam	King	41 ft	Fair	Recreation
Wapato Lake Dam	Chelan	40 ft	Fair	Recreation
Yale Saddle Dam	Cowlitz	40 ft	Unsatisfactory	Hydroelectric
Evans Flavorland Reservoir No 2	Yakima	40 ft	Satisfactory	Irrigation
Boeing Creek M1 Detention Dam	King	40 ft	Satisfactory	Flood Risk Reduction
William Symington Dam	Kitsap	39 ft	Satisfactory	Recreation
Spokane Hutterian Brethren Dam	Spokane	39 ft	Poor	Flood Risk Reduction
Heidelberg Materials Lewisville Phase 1 Dam	Clark	39 ft	Satisfactory	Other
Moxee Valley Orchards Dam	Yakima	39 ft	Poor	Irrigation
Beehive Dam	Chelan	38 ft	Satisfactory	Irrigation
Upriver Dam	Spokane	38 ft	Poor	Hydroelectric
Issaquah Highlands Reid Pond Dam	King	38 ft	Fair	Flood Risk Reduction
Ob-3 Process Water Storage Lagoon 2	Adams	37 ft	Not assessed	Irrigation
Trout Lake Storage Dam	San Juan	37 ft	Fair	Recreation
Parker Reservoir Dam	Yakima	36 ft	Poor	Irrigation
Fairview Reservoir No 1	Grays Harbor	35 ft	Poor	Water Supply