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 376–400 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mayfield Plunge Pool Barrier Lewis County | 14 | 1963 | Low | Satisfactory |
| Mayfield Forebay Dam Lewis County | 63 | 1963 | High | Satisfactory |
| Masonry Dam King County | 230 | 1914 | High | Satisfactory |
| Marysville Sewage Lagoon Snohomish County | 11 | 1959 | Low | Not Rated |
| Martins Lake Dam San Juan County | 13 | 1962 | Low | Not Rated |
| Martin Marietta Sludge Pond Klickitat County | 28 | 1981 | Low | Not Rated |
| Martin Dam Spokane County | 16 | 1972 | Low | Not Rated |
| Marshall Lake Dam Pend Oreille County | 10 | 1912 | High | Fair |
| Margaret Lake Dam King County | 41 | 1933 | High | Fair |
| Marcel Lake Dam King County | 31 | 1964 | High | Fair |
| Mallard Marsh Dam Pend Oreille County | 8 | 1960 | Low | Not Rated |
| Malinowski Dam Grays Harbor County | 51 | 1963 | High | Satisfactory |
| Malar Dam Clark County | 40 | 1955 | Low | Not Rated |
| Madsen Creek West Basin Dam King County | 13 | 2008 | High | Satisfactory |
| Macs Pond Dam Kitsap County | 39 | 1895 | Low | Not Rated |
| Lyon Lake Dam Grant County | 13 | 1971 | Low | Not Rated |
| Lunds Gulch Creek Regional Stormwater Detention Pond Snohomish County | 24 | 1992 | High | Fair |
| Lummi Island Estates Dam Whatcom County | 20 | 1963 | High | Fair |
| Ludvick Lake Dam Kitsap County | 17 | 1950 | Low | Not Rated |
| Lower Turnbull Dam Spokane County | 8 | 1960 | Low | Fair |
| Lower Rimrock Dam Douglas County | 67 | 1972 | Low | Not Rated |
| Lower Pine Lake Dam Spokane County | 18 | 1940 | Low | Satisfactory |
| Lower Monumental Lock and Dam Franklin County | 226 | 1969 | High | Not Available |
| Lower Granite Lock and Dam - North Levee Nez Perce County | 16 | 1974 | High | Not Available |
| Lower Baker Skagit County | 285 | 1927 | High | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.