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 101–125 of 404
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Selah Aerated Lagoon Yakima County | 11 | 1985 | High | Fair |
| Seattle Port Lagoon No 3 King County | 32 | 2001 | High | Satisfactory |
| Seattle City Volunteer Park Reservoir King County | 35 | 1901 | High | Satisfactory |
| Seatac Airport Pond M King County | 10 | 2011 | High | Satisfactory |
| Seatac Airport Pond G King County | 11 | 2009 | High | Satisfactory |
| Schweitzer Dam and Reservoir Okanogan County | 18 | 1914 | High | Poor |
| Salmon Lake Dam Okanogan County | 54 | 1921 | High | Not Available |
| Sacheen Lake Wwtp Lagoons Pend Oreille County | 15 | 2016 | High | Fair |
| Roza Ww5 Reregulation Reservoir Yakima County | 76 | 2017 | High | Satisfactory |
| Ross Whatcom County | 540 | 1949 | High | Satisfactory |
| Roosevelt Reservoir King County | 23 | 1910 | High | Satisfactory |
| Rocky Reach Chelan County | 130 | 1962 | High | Satisfactory |
| Rock Island Douglas County | 71 | 1932 | High | Satisfactory |
| Roche Pomona Dam Yakima County | 23 | 1995 | High | Satisfactory |
| Roche Harbor Lake Dam San Juan County | 15 | 2013 | High | Satisfactory |
| Regulating Basin West Dam King County | 32 | 1962 | High | Satisfactory |
| Reflection Lake South Dam Spokane County | 28 | 1955 | High | Fair |
| Reflection Lake North Dam Spokane County | 8 | 1955 | High | Fair |
| Redmond Ridge East Srs 1 Pond No 1 King County | 11 | 2013 | High | Satisfactory |
| Redmond Ridge East Pond Srn 2 No 1 King County | 14 | 2008 | High | Fair |
| Redmond Ridge Drive Ec 4n Roadway Dam King County | 8 | 2003 | High | Satisfactory |
| Redmond Ridge Cedar Dam King County | 26 | 2000 | High | Fair |
| Reardan Sewage Lagoon Lincoln County | 8 | 2006 | High | Fair |
| Rainbow Springs Dam Snohomish County | 14 | 1969 | High | Poor |
| Radar Lake Dam King County | 34 | 1973 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.