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 51–75 of 241
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Sunnyside Mp 23.7 Reservoir Yakima County | 43 | 2008 | High | Satisfactory |
| Stout Reservoir Dam Okanogan County | 29 | 1958 | High | Satisfactory |
| Stemilt Equalizing Reservoir Chelan County | 19 | 1985 | High | Satisfactory |
| Ste Michelle Canoe Ridge Evaporation Pond Benton County | 14 | 2012 | Significant | Satisfactory |
| Steilacoom Lake Dam Pierce County | 28 | 1989 | High | Satisfactory |
| St Clair Stormwater Detention Dam Whatcom County | 20 | 1986 | High | Satisfactory |
| Spscc Stormwater Pond F Thurston County | 10 | 2005 | High | Satisfactory |
| Spring Hill Saddle Dam Chelan County | 12 | 1918 | High | Satisfactory |
| Spring Hill Dam Chelan County | 30 | 1918 | High | Satisfactory |
| Spencer Lake San Juan County | 42 | 1983 | Low | Satisfactory |
| South Aeration Stabilization Basin Lady Island Clark County | 15 | 1977 | Low | Satisfactory |
| Solmar Lake Dam Clallam County | 16 | 1968 | High | Satisfactory |
| Snoqualmie Ridge Osprey Ct Pond D1 King County | 16 | 1999 | High | Satisfactory |
| Snoqualmie Falls King County | 19 | 1898 | Low | Satisfactory |
| Skookumchuck Thurston County | 160 | 1970 | High | Satisfactory |
| Sinlahekin Dam No 3 Okanogan County | 24 | 1950 | High | Satisfactory |
| Sinlahekin Dam No 1 Okanogan County | 14 | 1949 | High | Satisfactory |
| Silver Firs Detention Pond No 3 Snohomish County | 14 | 2000 | High | Satisfactory |
| Selah Naches Ranch Reservoir Yakima County | 20 | 2004 | High | Satisfactory |
| Selah Home Ranch Reservoir Yakima County | 22 | 2009 | High | Satisfactory |
| Seaway Center Stormwater Detention Dam Snohomish County | 39 | 1989 | Significant | Satisfactory |
| Seattle Port Lagoon No 3 King County | 32 | 2001 | High | Satisfactory |
| Seattle City Volunteer Park Reservoir King County | 35 | 1901 | High | Satisfactory |
| Seatac Airport Se Pond King County | 9 | 2007 | Significant | Satisfactory |
| Seatac Airport Pond M King County | 10 | 2011 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.