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High Risk Dams in Washington

Washington has 52 high hazard dams with a condition assessment of poor or unsatisfactory. These are dams where failure would probably cause loss of human life and where recognized safety deficiencies have been identified.

Of the 405 high hazard dams in Washington, 52 (12%) have concerning condition ratings — 47 rated poor and 5 rated unsatisfactory.

Condition scale, best to worst
  1. Satisfactory No existing or potential safety deficiencies recognized; acceptable performance expected under all loading conditions.
  2. Fair No deficiencies under normal operating conditions; a rare flood or earthquake could create one.
  3. Poor A safety deficiency is recognized under normal operating conditions; remedial action is necessary.
  4. Unsatisfactory Worst rating. The dam is considered unsafe; a deficiency requires immediate or emergency remedial action.

"Not rated" means no assessment is on file in the National Inventory of Dams.

DamCountyHeight (ft)ConditionLast inspectedPurposeYear
MossyrockLewis606Unsatisfactory08/20/20251 yr agoHydroelectric1968
Lower BakerSkagit285Poor07/11/20224 yrs agoHydroelectric1927
MayfieldLewis250Unsatisfactory08/21/20251 yr agoHydroelectric1963
WellsChelan160Poor09/16/20251 yr agoHydroelectric1968
Indian Creek DamPacific73Poor07/13/20233 yrs agoWater Supply1989
Ponderosa Lake DamStevens60Poor08/05/20215 yrs agoRecreation1969
Newcastle Railroad Embankment DamKing55Poor08/30/20188 yrs agoFlood Risk Reduction1900
Lords Lake East DamJefferson42Poor06/02/20206 yrs agoWater Supply1956
Yale Saddle DamCowlitz40Unsatisfactory09/16/20251 yr agoHydroelectric1953
Spokane Hutterian Brethren DamSpokane39Poor05/08/20197 yrs agoFlood Risk Reduction2006
Moxee Valley Orchards DamYakima39Poor06/08/201511 yrs agoIrrigation1985
Upriver DamSpokane38Poor07/23/20251 yr agoHydroelectric1937
Parker Reservoir DamYakima36Poor06/28/20179 yrs agoIrrigation1955
Fairview Reservoir No 1Grays Harbor35Poor06/28/20233 yrs agoWater Supply1915
Yelm Canal DikeThurston35Unsatisfactory06/06/20224 yrs agoHydroelectric1930
Klonaqua Lake DamChelan35Poor08/13/20188 yrs agoIrrigation1933
Evans Konnowac DamYakima33Poor04/16/201511 yrs agoIrrigation1990
College Hill ReservoirGrays Harbor31Poor03/21/20188 yrs agoWater Supply1899
Beacon Hill ReservoirGrays Harbor30Poor06/28/20233 yrs agoWater Supply1935
Koura DamKitsap28Poor08/17/20179 yrs agoIrrigation1949
Calispell Creek Dike and Pump PlantPend Oreille28Poor05/27/20224 yrs agoHydroelectric
Blair Reservoir DamBenton28Poor10/12/20214 yrs agoIrrigation1937
Elwick DamClallam25Poor10/14/20205 yrs agoIrrigation1962
Van Stone Pit Lake DamStevens25Poor09/08/20215 yrs agoTailings1999
Twin LakesFerry25Poor07/28/20206 yrs agoIrrigation1931
Swano Lake DamGrays Harbor24Poor11/12/20241 yr agoFish and Wildlife Pond1949
Kayak Lake DamSnohomish24Poor08/31/20233 yrs agoRecreation1965
Eightmile Lake Outlet DamChelan22Poor10/11/20187 yrs agoIrrigation1933
Belfair Wwtp Treated Water Storage PondMason22Poor05/27/20224 yrs agoOther2014
Olympic Orchards Dam 1Yakima21Poor11/16/20214 yrs agoIrrigation1985
Cascade Lake DamSan Juan21Poor06/06/20233 yrs agoHydroelectric1915
Kyte DamThurston20Poor08/13/20197 yrs agoIrrigation1966
Carlisle Lake DamLewis19Poor11/17/20205 yrs agoFish and Wildlife Pond1920
Schweitzer Dam and ReservoirOkanogan18Poor07/18/20188 yrs agoIrrigation1914
Colchuck Lake DamChelan18Poor08/13/20188 yrs agoIrrigation1930
Evans Far West Pond DamYakima18Poor04/16/201511 yrs agoIrrigation1997
Beitey Lake DamStevens17Poor11/19/20214 yrs agoRecreation1934
Meadow Lake DamChelan17Poor05/11/20224 yrs agoIrrigation1920
Stevenson DamYakima17Poor09/28/20215 yrs agoRecreation1969
Serenity Lake DamStevens17Poor08/26/20215 yrs agoRecreation1972
Whistle Lake DamSkagit15Poor07/07/20224 yrs agoFish and Wildlife Pond1925
Rabel DamOkanogan15Poor10/18/20214 yrs agoRecreation1940
Eaglemont Storm PondSnohomish14Poor07/12/20242 yrs agoFlood Risk Reduction2014
Rainbow Springs DamSnohomish14Poor10/22/20223 yrs agoRecreation1969
Newman Lake Flood Control DamSpokane13Poor07/14/20179 yrs agoFlood Risk Reduction1976
Den Hoed Dam No 1Yakima12Poor09/29/20215 yrs agoIrrigation1999
Haight Reservoir DamClark12Poor08/08/20197 yrs agoIrrigation1951
OwhiOkanogan12Unsatisfactory10/14/20214 yrs agoIrrigation1915
Mountain Meadows Lake DamPend Oreille10Poor09/27/20224 yrs agoRecreation1959
Nielsen Dam CSnohomish9Poor07/06/20224 yrs agoRecreation1973
Nielsen Dam BSnohomish9Poor07/06/20224 yrs agoRecreation1973
Square Lake DamChelan7Poor08/13/20188 yrs agoIrrigation1938

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