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 126–150 of 191
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Pasco Process Water Reuse Storage Lagoon Franklin County | 18 | 1997 | High | Fair |
| Paterson Ranch Reservoir Benton County | 23 | 2010 | High | Fair |
| Patterson Lake Dam Okanogan County | 32 | 1924 | High | Fair |
| Pigeon Creek No 1 Stormwater Detention D Snohomish County | 22 | 1990 | Significant | Fair |
| Potters Pond Dam Stevens County | 12 | 1959 | Low | Fair |
| Power Lake Dam Pend Oreille County | 60 | 1922 | High | Fair |
| Priest Rapids Grant County | 187 | 1961 | High | Fair |
| Quincy Brine Evaporation Ponds Grant County | 11 | 1989 | Significant | Fair |
| Quincy Sludge Storage Lagoon System Lagoons 1 2 and 3 Grant County | 15 | 1986 | Significant | Fair |
| Reardan Sewage Lagoon Lincoln County | 8 | 2006 | High | Fair |
| Rec Silicon Wastewater Pond Grant County | 23 | 2009 | Low | Fair |
| Redmond Ridge Cedar Dam King County | 26 | 2000 | High | Fair |
| Redmond Ridge East Pond Srn 2 No 1 King County | 14 | 2008 | High | Fair |
| Reflection Lake North Dam Spokane County | 8 | 1955 | High | Fair |
| Reflection Lake South Dam Spokane County | 28 | 1955 | High | Fair |
| Ritzville Wastewater Lagoons Adams County | 9 | 2000 | Significant | Fair |
| Rosalia Sewage Lagoon Whitman County | 10 | 1989 | Significant | Fair |
| Sacheen Lake Wwtp Lagoons Pend Oreille County | 15 | 2016 | High | Fair |
| Samish Wd Sewage Lagoon No. 1 Skagit County | 8 | 1974 | Significant | Fair |
| Samish Wd Sewage Lagoons Skagit County | 8 | 1974 | Significant | Fair |
| Selah Aerated Lagoon Yakima County | 11 | 1985 | High | Fair |
| Shiflett Reservoir No. 1 Chelan County | 19 | 1945 | High | Fair |
| Shiflett Reservoir No. 2 Chelan County | 16 | 1945 | High | Fair |
| Simplot Feeders Waste Pond No1 Walla Walla County | 15 | 1973 | Significant | Fair |
| Sinlahekin Dam No 2 Okanogan County | 18 | 1949 | High | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.