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 301–325 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| High Woodlands Stormwater Detention Dam King County | 27 | 1991 | Low | Not Rated |
| Hill Lake Dam Stevens County | 12 | 1984 | Low | Not Rated |
| Hilltop Waterski Pond Snohomish County | 30 | 1995 | High | Fair |
| Hiram M. Chittenden Locks and Dam King County | 63 | 1916 | High | Not Available |
| Hog Lake Dam Spokane County | 22 | 1957 | High | Fair |
| Holiday Lake Dam Whatcom County | 23 | 1967 | High | Fair |
| Holmes Harbor Reclaimed Water Ponds Island County | 66 | 1994 | Significant | Fair |
| Homestead Lake Dam Pend Oreille County | 22 | 1971 | Low | Not Rated |
| Honeymoon Lake Dam Island County | 20 | 1969 | High | Satisfactory |
| Horn School Rest Area Sewage Lagoon Whitman County | 19 | 1996 | High | Satisfactory |
| Horseshoe Lake Dam Stevens County | 45 | 2003 | High | Satisfactory |
| Horse Spring Coulee Dam Okanogan County | 67 | 1924 | Low | Not Rated |
| Horton Road Detention Dam Whatcom County | 13 | 1994 | High | Fair |
| Howard A. Hanson Dam King County | 235 | 1962 | High | Not Available |
| I405 Coal Creek Stormwater Detention Da King County | 31 | 1987 | Low | Not Rated |
| Ice Harbor Lock and Dam Walla Walla County | 208 | 1962 | High | Not Available |
| Ice Harbor Ranch Block 211 Reservoir Franklin County | 25 | 2013 | Low | Not Rated |
| Icon Materials Pond 4 King County | 140 | 1997 | High | Fair |
| Iman Lake Dam Skamania County | 16 | 1996 | High | Fair |
| Indian Creek Dam Pacific County | 73 | 1989 | High | Poor |
| Ingredion Process Water Lagoon Grant County | 9 | 2000 | Significant | Satisfactory |
| Interfor Pacific Stormwater Pond Clallam County | 8 | 2001 | High | Satisfactory |
| Ione Mill Pond Pend Oreille County | 35 | 1914 | Low | Not Rated |
| Isaak Dam No 4 Douglas County | 9 | 1987 | High | Fair |
| Islewood Dam Skagit County | 18 | 1971 | High | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.