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 476–500 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Moses Lake South Dam Grant County | 20 | 1961 | Low | Not Available |
| Mossyrock - Saddle Dike Lewis County | 23 | 1968 | Low | Satisfactory |
| Mountain Lake Dam San Juan County | 17 | 1905 | High | Fair |
| Mountain Meadows Lake Dam Pend Oreille County | 10 | 1959 | High | Poor |
| Mountain Pond Dam Walla Walla County | 42 | 1992 | High | Fair |
| Mountain View East Storm Ponds Snohomish County | 11 | 2021 | High | Not Rated |
| Mount St. Helens Sediment Retention Structure Cowlitz County | 239 | 1988 | High | Not Available |
| Moxee Valley Orchards Dam Yakima County | 39 | 1985 | High | Poor |
| Mud Mountain Dam King County | 425 | 1948 | High | Not Available |
| Muth Stormwater Pond King County | 12 | 2007 | High | Satisfactory |
| Nada Dam Chelan County | 9 | 1939 | Low | Satisfactory |
| Nestle Potato Effluent Lagoon Grant County | 32 | 1994 | Low | Not Rated |
| Newcastle Railroad Embankment Dam King County | 55 | 1900 | High | Poor |
| Newcastle Vista Pond 3 King County | 11 | 2012 | High | Fair |
| Newman Lake Flood Control Dam Spokane County | 13 | 1976 | High | Poor |
| Nielsen Dam A Snohomish County | 15 | 1950 | Low | Not Rated |
| Nielsen Dam B Snohomish County | 9 | 1973 | High | Poor |
| Nielsen Dam C Snohomish County | 9 | 1973 | High | Poor |
| 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 |
| Nookachamps Hills Dam Skagit County | 54 | 1969 | Significant | Poor |
| 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 Dam Grant County | 145 | 1951 | High | Not Available |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.