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 26–50 of 312
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Upper Falls Control Works Spokane County | 24 | 1922 | Low | Satisfactory |
| Upper Blackhorse Dam Spokane County | 10 | 1960 | Low | Fair |
| Unruh Reservoir Dam Whatcom County | 21 | 1959 | Low | Not Rated |
| Tukwila South Project South Pond King County | 21 | 2011 | Low | Satisfactory |
| Tree Top Selah Wastewater Lagoon Yakima County | 15 | 1991 | Low | Not Rated |
| Three Rivers Mill Pond Dam Snohomish County | 10 | 1946 | Low | Not Rated |
| Three Lakes Reservoir Dam Chelan County | 9 | 1908 | Low | Not Rated |
| Thorald Dam San Juan County | 19 | 1988 | Low | Not Rated |
| Texas Pond Skagit County | 14 | 1970 | Low | Not Rated |
| Tempo Lake Dam Thurston County | 10 | 1960 | Low | Not Rated |
| Teal Duck Slough Dam Pacific County | 8 | 1960 | Low | Not Rated |
| Tapps Lake Dike No 15 Pierce County | 27 | 1911 | Low | Satisfactory |
| Tapps Lake Dike No 14 Pierce County | 256 | 1911 | Low | Satisfactory |
| Taggares Dam No 2 Adams County | 14 | 1968 | Low | Not Rated |
| Taggares Dam No 1 Adams County | 14 | 1968 | Low | Not Rated |
| Tacoma Sportsman Pond Pend Oreille County | 10 | 1954 | Low | Not Rated |
| Swofford Pond Lewis County | 26 | — | Low | Satisfactory |
| Swift No 2 Hydroelectric Project Cowlitz County | 121 | 1959 | Low | Satisfactory |
| Sunnyside Indust Wastewater Lag 1 2 & 3 Yakima County | 17 | 1992 | Low | Not Rated |
| Sunheaven Farms Reservoir Benton County | 13 | 1986 | Low | Not Rated |
| Sundstrom Dam No 2 San Juan County | 28 | 1984 | Low | Not Rated |
| Sundstrom Dam No 1 San Juan County | 16 | 1970 | Low | Not Rated |
| Summit Lake Dam Thurston County | 7 | 1955 | Low | Not Rated |
| Stanwood Wastewater Pond Snohomish County | 8 | 1980 | Low | Not Rated |
| Squires Lake Dam Whatcom County | 15 | 1960 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.