Dams in Washington
814
Total Dams
411
High Hazard
50.49%
% High Hazard
55.0 yrs
Average Age
Counties
| County | Dams | High Hazard | % High | Avg Age |
|---|---|---|---|---|
| King | 93 | 62 | 66.67% | 45.2 yrs |
| Yakima | 49 | 36 | 73.47% | 37.3 yrs |
| Chelan | 38 | 33 | 86.84% | 77.8 yrs |
| Pierce | 35 | 25 | 71.43% | 77.0 yrs |
| Whatcom | 30 | 22 | 73.33% | 53.9 yrs |
| Snohomish | 43 | 22 | 51.16% | 51.6 yrs |
| Okanogan | 32 | 20 | 62.50% | 87.7 yrs |
| Stevens | 34 | 14 | 41.18% | 53.0 yrs |
| Grant | 44 | 13 | 29.55% | 47.7 yrs |
| Skagit | 23 | 12 | 52.17% | 61.9 yrs |
| Spokane | 29 | 11 | 37.93% | 62.1 yrs |
| Benton | 28 | 10 | 35.71% | 37.2 yrs |
| Kitsap | 18 | 10 | 55.56% | 53.6 yrs |
| Pend Oreille | 27 | 10 | 37.04% | 58.0 yrs |
| Lewis | 35 | 10 | 28.57% | 49.6 yrs |
| Grays Harbor | 14 | 10 | 71.43% | 78.7 yrs |
| San Juan | 37 | 9 | 24.32% | 57.7 yrs |
| Mason | 17 | 8 | 47.06% | 54.9 yrs |
| Thurston | 17 | 7 | 41.18% | 57.1 yrs |
| Clark | 17 | 6 | 35.29% | 55.2 yrs |
| Lincoln | 9 | 6 | 66.67% | 49.3 yrs |
| Walla Walla | 12 | 6 | 50.00% | 39.0 yrs |
| Clallam | 8 | 6 | 75.00% | 62.5 yrs |
| Kittitas | 9 | 6 | 66.67% | 79.8 yrs |
| Franklin | 24 | 5 | 20.83% | 39.6 yrs |
| Adams | 18 | 5 | 27.78% | 48.0 yrs |
| Douglas | 15 | 4 | 26.67% | 61.1 yrs |
| Cowlitz | 14 | 4 | 28.57% | 50.8 yrs |
| Island | 8 | 4 | 50.00% | 49.5 yrs |
| Whitman | 4 | 3 | 75.00% | 43.0 yrs |
| Skamania | 7 | 3 | 42.86% | 61.7 yrs |
| Jefferson | 4 | 3 | 75.00% | 62.3 yrs |
| Ferry | 8 | 3 | 37.50% | 47.1 yrs |
| Klickitat | 7 | 1 | 14.29% | 48.9 yrs |
| Pacific | 4 | 1 | 25.00% | 46.5 yrs |
Purpose Breakdown
Tallest Dams in Washington
| Dam Name | Height | County | Hazard |
|---|---|---|---|
| Grand Coulee | 550 ft | Okanogan | High Hazard |
| Ross | 540 ft | Whatcom | High Hazard |
| Swift No. 1 | 412 ft | Skamania | High Hazard |
| Diablo | 389 ft | Whatcom | High Hazard |
| Mossyrock | 366 ft | Lewis | High Hazard |
| Boundary | 340 ft | Pend Oreille | High Hazard |
| Yale | 323 ft | Cowlitz | High Hazard |
| Merwin | 313 ft | Cowlitz | High Hazard |
| Upper Baker | 312 ft | Whatcom | High Hazard |
| Gorge | 300 ft | Whatcom | High Hazard |