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 251–275 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Redmond Ridge Cedar Dam King County | 26 | 2000 | High | Fair |
| Rec Silicon Wastewater Pond Grant County | 23 | 2009 | Low | Fair |
| Rearing Pond Dike Grant County | 12 | 1964 | Low | Not Rated |
| Reardan Sewage Lagoon Lincoln County | 8 | 2006 | High | Fair |
| Ravensdale Pit King County | 18 | 1972 | Low | Not Rated |
| Rainbow Springs Dam Snohomish County | 14 | 1969 | High | Poor |
| Rainbow Lake Dam Columbia County | 14 | 1955 | Low | Not Rated |
| Radar Lake Dam King County | 34 | 1973 | High | Satisfactory |
| Rabel Dam Okanogan County | 15 | 1940 | High | Poor |
| Quincy Sludge Storage Lagoon System Lagoons 1 2 and 3 Grant County | 15 | 1986 | Significant | Fair |
| Quincy Brine Evaporation Ponds Grant County | 11 | 1989 | Significant | Fair |
| Quincy Aerated Lagoon No 2 Grant County | 12 | 1987 | Significant | Not Rated |
| Quincy Aerated Lagoon No 1 Grant County | 12 | 1987 | Significant | Not Rated |
| Queens Bog Dam King County | 12 | 1987 | Low | Not Rated |
| Quadrant Lake No 1 King County | 8 | 1994 | Low | Not Rated |
| Quadrant East Campus Parcel 1 King County | 11 | 2000 | Significant | Satisfactory |
| Pumping Pond Dike Whatcom County | 22 | 1960 | Low | Satisfactory |
| Prosser Warehouse Treatment Lagoon Benton County | 14 | 2012 | Significant | Satisfactory |
| Prosser Diversion Dam Benton County | 9 | 1904 | Low | Not Available |
| Priest Rapids Grant County | 187 | 1961 | High | Fair |
| Power Lake Dam Pend Oreille County | 60 | 1922 | High | Fair |
| Powell Dam Lewis County | 11 | 1963 | Low | Not Rated |
| Potters Pond Dam Stevens County | 12 | 1959 | Low | Fair |
| Port Townsend Paper Asb Pond Jefferson County | 27 | 1978 | High | Satisfactory |
| Port of Sunnyside Anaerobic Pretreatment System Yakima County | 22 | 2015 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.