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 526–550 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Panther Lake Detention Dam King County | 12 | 1994 | High | Fair |
| Panther Lk First Avenue Bas Detent Pond King County | 9 | 2000 | High | Satisfactory |
| Parker Reservoir Dam Yakima County | 36 | 1955 | High | Poor |
| Partridge Ranch Dam Grant County | 12 | 2010 | High | Satisfactory |
| Pasco Industrial Wastewater System Franklin County | 15 | 1995 | Significant | Satisfactory |
| 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 |
| Peabody Heights Reservoir Clallam County | 24 | 1925 | High | Satisfactory |
| Pend Oreille Mine Ne Tailings Dam Pend Oreille County | 72 | 2003 | Significant | Satisfactory |
| Pend Oreille Mine Nw Tailings Dam Pend Oreille County | 67 | 2003 | Significant | Satisfactory |
| Peterson Stormwater Detention Dam King County | 15 | 1988 | High | Satisfactory |
| Pigeon Creek No 1 Stormwater Detention D Snohomish County | 22 | 1990 | Significant | Fair |
| Pinto Dam Grant County | 130 | 1948 | High | Not Available |
| Ponderay Newsprint Mill Settling Lagoon Pend Oreille County | 24 | 1989 | Low | Not Rated |
| Ponderosa Lake Dam Stevens County | 60 | 1969 | High | Poor |
| Port of Moses Lake Lagoon Grant County | 30 | 1999 | Low | Not Rated |
| Port of Sunnyside Anaerobic Pretreatment System Yakima County | 22 | 2015 | High | Satisfactory |
| Port Townsend Paper Asb Pond Jefferson County | 27 | 1978 | High | Satisfactory |
| Potters Pond Dam Stevens County | 12 | 1959 | Low | Fair |
| Powell Dam Lewis County | 11 | 1963 | Low | Not Rated |
| Power Lake Dam Pend Oreille County | 60 | 1922 | High | Fair |
| Priest Rapids Grant County | 187 | 1961 | High | Fair |
| Prosser Diversion Dam Benton County | 9 | 1904 | Low | Not Available |
| Prosser Warehouse Treatment Lagoon Benton County | 14 | 2012 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.