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 241
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Moran Slough Dike Grant County | 13 | 1964 | Low | Satisfactory |
| Mossyrock - Saddle Dike Lewis County | 23 | 1968 | Low | Satisfactory |
| Muth Stormwater Pond King County | 12 | 2007 | High | Satisfactory |
| Nada Dam Chelan County | 9 | 1939 | Low | Satisfactory |
| Nine Mile Spokane County | 87 | 1908 | High | Satisfactory |
| N Marysville Regional Stormwater Pond Snohomish County | 11 | 2004 | High | Satisfactory |
| N Marysville Regional Stormwater Pond No. 2 Snohomish County | 7 | 2015 | High | Satisfactory |
| North Aeration Stabilization Basin Lady Island Clark County | 20 | 1977 | Significant | Satisfactory |
| North Bay Water Reclamation Pond 1 Mason County | 14 | 2000 | Significant | Satisfactory |
| North Ranch Storage Lagoon Mason County | 18 | 2018 | Significant | Satisfactory |
| Ob-3 Warden Digester Lagoon Grant County | 21 | 2018 | High | Satisfactory |
| Olympic Orchards Dam 5 Yakima County | 17 | 1985 | High | Satisfactory |
| Olympic View Landfill Leachate Lagoon 1 Kitsap County | 24 | 1997 | High | Satisfactory |
| Orchards Block 96 Reservoir Dam Walla Walla County | 32 | 2001 | High | Satisfactory |
| Packwood Lake Lewis County | 14 | 1964 | High | Satisfactory |
| Padden Lake Dam Whatcom County | 13 | 1933 | High | Satisfactory |
| Panther Lk First Avenue Bas Detent Pond King County | 9 | 2000 | High | Satisfactory |
| Partridge Ranch Dam Grant County | 12 | 2010 | High | Satisfactory |
| Pasco Industrial Wastewater System Franklin County | 15 | 1995 | Significant | Satisfactory |
| 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 |
| Port of Sunnyside Anaerobic Pretreatment System Yakima County | 22 | 2015 | High | Satisfactory |
| Port Townsend Paper Asb Pond Jefferson County | 27 | 1978 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.