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 201–225 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Selah Naches Ranch Reservoir Yakima County | 20 | 2004 | High | Satisfactory |
| Selah Home Ranch Reservoir Yakima County | 22 | 2009 | High | Satisfactory |
| Selah Aerated Lagoon Yakima County | 11 | 1985 | High | Fair |
| Seeley Ski Lake Thurston County | 9 | 1992 | Low | Not Rated |
| Section 34 Re Regulating Reservoir Franklin County | 17 | 2005 | Low | Not Rated |
| 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 |
| Seatac Airport Pond G King County | 11 | 2009 | High | Satisfactory |
| Sea Horse Ranch Dike Grays Harbor County | 15 | 1961 | Low | Not Rated |
| Scooteney North Dike Franklin County | 16 | 1952 | Low | Not Available |
| Scooteney Headworks Dike Franklin County | 26 | 1952 | Low | Not Available |
| Scooteney Dike 1 Franklin County | 10 | 1952 | Low | Not Available |
| Schweitzer Dam and Reservoir Okanogan County | 18 | 1914 | High | Poor |
| Schallow Lake Dam Okanogan County | 13 | 1954 | Low | Not Rated |
| Scabrock Feeders Dam 6c Adams County | 11 | 1970 | Low | Not Rated |
| Scabrock Feeders Dam 6a Adams County | 15 | 1970 | Low | Not Rated |
| Scabrock Feeders Dam 3 Adams County | 16 | 1968 | Low | Not Rated |
| Sawyer Lake Outlet Structure King County | 10 | 1952 | Low | Not Rated |
| Sasse Reservoir Dam Okanogan County | 10 | 1910 | Low | Not Rated |
| San Refugio Ranch Dam Klickitat County | 16 | 1977 | Low | Not Rated |
| Samish Wd Sewage Lagoons Skagit County | 8 | 1974 | Significant | Fair |
| Samish Wd Sewage Lagoon No. 1 Skagit County | 8 | 1974 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.