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 451–475 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mcdowell Lake Dam Stevens County | 16 | 1973 | Low | Not Rated |
| Mckay Dam Douglas County | 15 | 1961 | Low | Not Rated |
| Meadow Lake Dam Chelan County | 17 | 1920 | High | Poor |
| Melbourne Lake Dam Mason County | 9 | 1957 | Low | Not Rated |
| Merry Dam Grant County | 10 | 1976 | Low | Not Rated |
| Merwin Cowlitz County | 313 | 1931 | High | Fair |
| Metaline Falls Wastewater Lagoon No 3 Pend Oreille County | 11 | 1963 | Significant | Fair |
| Meyers Falls Stevens County | 26 | 1961 | Low | Satisfactory |
| Middle Pine Lake Dam Spokane County | 11 | 1938 | Low | Poor |
| Milk Pond Dam Kittitas County | 12 | 1980 | Low | Not Rated |
| Mill Creek Canyon Stormwater Detention D King County | 22 | 1982 | High | Satisfactory |
| Mill Creek Dam Cosmopolis Grays Harbor County | 20 | 2019 | High | Satisfactory |
| Mill Creek Storage Dam Walla Walla County | 145 | 1942 | High | Not Available |
| Mill Creek Storage Dam - Diversion Dam Walla Walla County | 14 | 1942 | Significant | Not Available |
| Miller Creek Regional Detention Facility King County | 16 | 1992 | Significant | Satisfactory |
| Miller Reservoir Dam Stevens County | 14 | 1959 | Low | Not Rated |
| Milles Lake Dam Okanogan County | 6 | 1950 | High | Satisfactory |
| Mill Pond Dam Klickitat Co Klickitat County | 18 | 1951 | Low | Not Rated |
| Mill Pond Stormwater Detention Dam King County | 13 | 1994 | High | Satisfactory |
| Minckler Dam A Island County | 11 | 1975 | High | Fair |
| Minckler Dam B Island County | 25 | 1975 | High | Fair |
| Moccasin Lake Dam Okanogan County | 17 | 1969 | High | Fair |
| Moran Slough Dike Grant County | 13 | 1964 | Low | Satisfactory |
| Morse Lake Overflow Dike King County | 30 | 1904 | Low | Not Rated |
| Moses Lake North Dam Grant County | 19 | 1930 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.