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 301–325 of 404
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Seatac Airport Pond M King County | 10 | 2011 | High | Satisfactory |
| Seattle City Volunteer Park Reservoir King County | 35 | 1901 | High | Satisfactory |
| Seattle Port Lagoon No 3 King County | 32 | 2001 | High | Satisfactory |
| Selah Aerated Lagoon Yakima County | 11 | 1985 | High | Fair |
| Selah Home Ranch Reservoir Yakima County | 22 | 2009 | High | Satisfactory |
| Selah Naches Ranch Reservoir Yakima County | 20 | 2004 | High | Satisfactory |
| Serenity Lake Dam Stevens County | 17 | 1972 | High | Poor |
| Shiflett Reservoir No. 1 Chelan County | 19 | 1945 | High | Fair |
| Shiflett Reservoir No. 2 Chelan County | 16 | 1945 | High | Fair |
| Silver Firs Detention Pond No 3 Snohomish County | 14 | 2000 | High | Satisfactory |
| Sinclair Ridge Storm Pond Kitsap County | 15 | 2024 | High | Not Rated |
| Sinlahekin Dam No 1 Okanogan County | 14 | 1949 | High | Satisfactory |
| Sinlahekin Dam No 2 Okanogan County | 18 | 1949 | High | Fair |
| Sinlahekin Dam No 3 Okanogan County | 24 | 1950 | High | Satisfactory |
| Skookumchuck Thurston County | 160 | 1970 | High | Satisfactory |
| Snoqualmie Ridge Osprey Ct Pond D1 King County | 16 | 1999 | High | Satisfactory |
| Solmar Lake Dam Clallam County | 16 | 1968 | High | Satisfactory |
| South 336th Street Stormwater Dam No 1 King County | 12 | 1996 | High | Fair |
| South 336th Street Stormwater Dam No 2 King County | 19 | 1996 | High | Fair |
| South Fork Mccorkle Creek Detention Dam Cowlitz County | 22 | 1989 | High | Fair |
| South Ridge Stormwater Detention Dam King County | 10 | 2002 | High | Fair |
| Southwest Genesee Street Detention Dam King County | 27 | 1974 | High | Fair |
| Spokane Hutterian Brethren Dam Spokane County | 39 | 2006 | High | Poor |
| Sprague Wastewater Treatment Lagoons Lincoln County | 14 | 1993 | High | Fair |
| Spring Hill Dam Chelan County | 30 | 1918 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.