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 626–650 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Shoecraft Lake Outlet Snohomish County | 10 | 1952 | Low | Not Rated |
| Silver Firs Detention Pond No 3 Snohomish County | 14 | 2000 | High | Satisfactory |
| Silver Lake Dam Cowlitz County | 15 | 1971 | Low | Not Rated |
| Simplot Feeders Waste Pond No1 Walla Walla County | 15 | 1973 | Significant | Fair |
| Simplot Lrar Lagoon Grant County | 24 | 2006 | Low | Not Rated |
| Sims Dam Douglas County | 7 | 1960 | Low | Not Rated |
| Sinclair Ridge Storm Pond Kitsap County | 15 | 2024 | High | Not Rated |
| Sinlahekin Dam No 1 Okanogan County | 14 | 1949 | High | Satisfactory |
| Sinlahekin Dam No 2 Okanogan County | 18 | 1949 | High | Fair |
| Sinlahekin Dam No 3 Okanogan County | 24 | 1950 | High | Satisfactory |
| Skagit Lake Dam Skagit County | 19 | 1971 | Low | Not Rated |
| Skookumchuck Thurston County | 160 | 1970 | High | Satisfactory |
| Slavic Lake Dam Pierce County | 13 | 1990 | Significant | Poor |
| Sleepy Hollow Dam Stevens County | 15 | 2000 | Low | Not Rated |
| Smith Brothers Dairy Storage Lagoon Grant County | 15 | 2001 | Low | Not Rated |
| Smrekar Reservoir Dam Whatcom County | 27 | 1954 | Low | Not Rated |
| Snakebite Reservoir Dam Franklin County | 7 | 1976 | Low | Not Rated |
| Snohomish Sewage Lagoon Snohomish County | 11 | 1958 | Low | Not Rated |
| Snohomish Wastewater Treatment Lagoon Sy Snohomish County | 17 | 1995 | Low | Not Rated |
| Snook Lake Dam Stevens County | 10 | 1953 | Low | Not Rated |
| Snoqualmie Falls King County | 19 | 1898 | Low | Satisfactory |
| Snoqualmie Mill Pond Dam King County | 10 | 1917 | Low | Not Rated |
| Snoqualmie Pass Pud Sewage Lagoon No 1 Kittitas County | 23 | 1982 | Low | Not Rated |
| Snoqualmie Ridge Golf Course Pond M1 King County | 18 | 1997 | Low | Not Rated |
| Snoqualmie Ridge Osprey Ct Pond D1 King County | 16 | 1999 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.