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 251–275 of 404
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Issaquah Highlands Reid Pond Dam King County | 38 | 2003 | High | Fair |
| Issaquah Highlands Npe Pond King County | 24 | 2003 | High | Fair |
| Issaquah Highlands Np2 Pond Dam King County | 28 | 2002 | High | Fair |
| Issaquah Highlands Falls Pond Dam King County | 22 | 2008 | High | Satisfactory |
| Islewood Dam Skagit County | 18 | 1971 | High | Fair |
| Isaak Dam No 4 Douglas County | 9 | 1987 | High | Fair |
| Interfor Pacific Stormwater Pond Clallam County | 8 | 2001 | High | Satisfactory |
| Indian Creek Dam Pacific County | 73 | 1989 | High | Poor |
| Iman Lake Dam Skamania County | 16 | 1996 | High | Fair |
| Icon Materials Pond 4 King County | 140 | 1997 | High | Fair |
| Ice Harbor Lock and Dam Walla Walla County | 208 | 1962 | High | Not Available |
| Howard A. Hanson Dam King County | 235 | 1962 | High | Not Available |
| Horton Road Detention Dam Whatcom County | 13 | 1994 | High | Fair |
| Horseshoe Lake Dam Stevens County | 45 | 2003 | High | Satisfactory |
| Horn School Rest Area Sewage Lagoon Whitman County | 19 | 1996 | High | Satisfactory |
| Honeymoon Lake Dam Island County | 20 | 1969 | High | Satisfactory |
| Holiday Lake Dam Whatcom County | 23 | 1967 | High | Fair |
| Hog Lake Dam Spokane County | 22 | 1957 | High | Fair |
| Hiram M. Chittenden Locks and Dam King County | 63 | 1916 | High | Not Available |
| Hilltop Waterski Pond Snohomish County | 30 | 1995 | High | Fair |
| H & H Reservoir Dam No 1 Chelan County | 19 | 1926 | High | Satisfactory |
| Heidelberg Materials Lewisville Phase 1 Dam Clark County | 39 | 2007 | High | Satisfactory |
| Hawkins Dam Okanogan County | 16 | 1940 | High | Fair |
| Harbor Hill North Pond Pierce County | 21 | 2014 | High | Satisfactory |
| Happy Valley Stormwater Detention Basin Whatcom County | 14 | 1981 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.