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 26–50 of 191
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Sylvia Lake Dam Pierce Co Pierce County | 16 | 1963 | Significant | Fair |
| Swift No. 1 Skamania County | 412 | 1958 | High | Fair |
| Sunnyside Mp 59.29 Reservoir Benton County | 44 | 2005 | High | Fair |
| Sunnyside Mp 37.1 Reservoir Yakima County | 34 | 2011 | High | Fair |
| Sunny Dene Dairy Waste Pond Yakima County | 21 | 2004 | Significant | Fair |
| Sullivan Lake Pend Oreille County | 34 | 1923 | High | Fair |
| Stemilt Saddle Dam Chelan County | 9 | 1962 | High | Fair |
| Stemilt Main Dam Chelan County | 65 | 1962 | High | Fair |
| Steffen Brothers Reservoir Dam Chelan County | 15 | 1947 | High | Fair |
| Springwood Stormwater Detention Dam King County | 10 | 1992 | High | Fair |
| Sprague Wastewater Treatment Lagoons Lincoln County | 14 | 1993 | High | Fair |
| Southwest Genesee Street Detention Dam King County | 27 | 1974 | High | Fair |
| South Ridge Stormwater Detention Dam King County | 10 | 2002 | High | Fair |
| South Fork Mccorkle Creek Detention Dam Cowlitz County | 22 | 1989 | High | Fair |
| South 336th Street Stormwater Dam No 2 King County | 19 | 1996 | High | Fair |
| South 336th Street Stormwater Dam No 1 King County | 12 | 1996 | High | Fair |
| Sinlahekin Dam No 2 Okanogan County | 18 | 1949 | High | Fair |
| Simplot Feeders Waste Pond No1 Walla Walla County | 15 | 1973 | Significant | Fair |
| Shiflett Reservoir No. 2 Chelan County | 16 | 1945 | High | Fair |
| Shiflett Reservoir No. 1 Chelan County | 19 | 1945 | High | Fair |
| Selah Aerated Lagoon Yakima County | 11 | 1985 | High | Fair |
| Samish Wd Sewage Lagoons Skagit County | 8 | 1974 | Significant | Fair |
| Samish Wd Sewage Lagoon No. 1 Skagit County | 8 | 1974 | Significant | Fair |
| Sacheen Lake Wwtp Lagoons Pend Oreille County | 15 | 2016 | High | Fair |
| Rosalia Sewage Lagoon Whitman County | 10 | 1989 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.