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 576–600 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Rio Mount Dam Snohomish County | 22 | 1979 | Low | Not Rated |
| Ritzville Wastewater Lagoons Adams County | 9 | 2000 | Significant | Fair |
| Roche Harbor Lake Dam San Juan County | 15 | 2013 | High | Satisfactory |
| Roche Pomona Dam Yakima County | 23 | 1995 | High | Satisfactory |
| Rockford Wastewater Pond No. 3 Spokane County | 24 | 1999 | Significant | Satisfactory |
| Rock Island Douglas County | 71 | 1932 | High | Satisfactory |
| Rocky Reach Chelan County | 130 | 1962 | High | Satisfactory |
| Roosevelt Reservoir King County | 23 | 1910 | High | Satisfactory |
| Rosalia Sewage Lagoon Whitman County | 10 | 1989 | Significant | Fair |
| Roslyn Wastewater Lagoon No 3 Kittitas County | 10 | 1973 | Low | Not Rated |
| Ross Whatcom County | 540 | 1949 | High | Satisfactory |
| Roza Diversion Dam Kittitas County | 67 | 1939 | Low | Not Available |
| Roza Wasteway 6 Reregulation Reservoir Benton County | 20 | 1988 | Low | Not Rated |
| Roza Ww5 Reregulation Reservoir Yakima County | 76 | 2017 | High | Satisfactory |
| Ruth Lake Dam Kitsap County | 18 | 1977 | Low | Poor |
| Sacheen Lake Wwtp Lagoons Pend Oreille County | 15 | 2016 | High | Fair |
| Salmon Lake Dam Okanogan County | 54 | 1921 | High | Not Available |
| Samish Wd Sewage Lagoon No. 1 Skagit County | 8 | 1974 | Significant | Fair |
| Samish Wd Sewage Lagoons Skagit County | 8 | 1974 | Significant | Fair |
| San Refugio Ranch Dam Klickitat County | 16 | 1977 | Low | Not Rated |
| Sasse Reservoir Dam Okanogan County | 10 | 1910 | Low | Not Rated |
| Sawyer Lake Outlet Structure King County | 10 | 1952 | Low | Not Rated |
| Scabrock Feeders Dam 3 Adams County | 16 | 1968 | Low | Not Rated |
| Scabrock Feeders Dam 6a Adams County | 15 | 1970 | Low | Not Rated |
| Scabrock Feeders Dam 6c Adams County | 11 | 1970 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.