Washington Dams
817 dams tracked by the National Inventory of Dams
Total Dams
817
High Hazard
404
49.4%
Poor / Unsatisfactory
65
Average Age
55 yrs
Hazard Classification
High404 (49.4%)
Significant98 (12.0%)
Low312 (38.2%)
Condition Assessment
Satisfactory241 (29.5%)
Fair191 (23.4%)
Poor / Unsatisfactory65 (8.0%)
Not Rated320 (39.2%)
Federal
69
State
42
Local
193
Private
392
Tallest Dams
- Grand Coulee Dam550 ft
- Ross540 ft
- Mud Mountain Dam425 ft
- Swift No. 1412 ft
- Diablo389 ft
High Hazard Dams
- Grand Coulee DamHigh
- RossHigh
- Mud Mountain DamHigh
- Swift No. 1High
- DiabloHigh
Poor Condition Dams
- Lower BakerPoor
- WellsPoor
- Van Stone Tailings DamPoor
- Indian Creek DamPoor
- Butterworth DamPoor
All Dams in Washington
Showing 676–700 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| St Clair Stormwater Detention Dam Whatcom County | 20 | 1986 | High | Satisfactory |
| Steffen Brothers Reservoir Dam Chelan County | 15 | 1947 | High | Fair |
| Steilacoom Lake Dam Pierce County | 28 | 1989 | High | Satisfactory |
| Ste Michelle Canoe Ridge Evaporation Pond Benton County | 14 | 2012 | Significant | Satisfactory |
| Stemilt Equalizing Reservoir Chelan County | 19 | 1985 | High | Satisfactory |
| Stemilt Main Dam Chelan County | 65 | 1962 | High | Fair |
| Stemilt Saddle Dam Chelan County | 9 | 1962 | High | Fair |
| Stevenson Dam Yakima County | 17 | 1969 | High | Poor |
| Stout Reservoir Dam Okanogan County | 29 | 1958 | High | Satisfactory |
| Sullivan Lake Pend Oreille County | 34 | 1923 | High | Fair |
| Summit Lake Dam Thurston County | 7 | 1955 | Low | Not Rated |
| Sundstrom Dam No 1 San Juan County | 16 | 1970 | Low | Not Rated |
| Sundstrom Dam No 2 San Juan County | 28 | 1984 | Low | Not Rated |
| Sunheaven Farms Reservoir Benton County | 13 | 1986 | Low | Not Rated |
| Sunny Dene Dairy Waste Pond Yakima County | 21 | 2004 | Significant | Fair |
| Sunnyside Indust Wastewater Lag 1 2 & 3 Yakima County | 17 | 1992 | Low | Not Rated |
| Sunnyside Mp 23.7 Reservoir Yakima County | 43 | 2008 | High | Satisfactory |
| Sunnyside Mp 37.1 Reservoir Yakima County | 34 | 2011 | High | Fair |
| Sunnyside Mp 59.29 Reservoir Benton County | 44 | 2005 | High | Fair |
| Svid Mabton Canal 12.48 Reservoir Yakima County | 9 | 2010 | High | Satisfactory |
| Swano Lake Dam Grays Harbor County | 24 | 1949 | High | Poor |
| Swift No. 1 Skamania County | 412 | 1958 | High | Fair |
| Swift No 2 Hydroelectric Project Cowlitz County | 121 | 1959 | Low | Satisfactory |
| Swofford Pond Lewis County | 26 | — | Low | Satisfactory |
| Sylvia Lake Dam Grays Harbor Cnty Grays Harbor County | 23 | 1918 | Significant | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.