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 226–250 of 312
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Scabrock Feeders Dam 6c Adams County | 11 | 1970 | Low | Not Rated |
| Schallow Lake Dam Okanogan County | 13 | 1954 | Low | Not Rated |
| Scooteney Dike 1 Franklin County | 10 | 1952 | Low | Not Available |
| Scooteney Headworks Dike Franklin County | 26 | 1952 | Low | Not Available |
| Scooteney North Dike Franklin County | 16 | 1952 | Low | Not Available |
| Sea Horse Ranch Dike Grays Harbor County | 15 | 1961 | Low | Not Rated |
| Section 34 Re Regulating Reservoir Franklin County | 17 | 2005 | Low | Not Rated |
| Seeley Ski Lake Thurston County | 9 | 1992 | Low | Not Rated |
| Serene Lake Pierce County | 9 | 1971 | Low | Not Rated |
| Sheep Springs Dam Adams County | 30 | 1906 | Low | Not Rated |
| Shell Refinery Water Storage Reservoir Skagit County | 28 | 1958 | Low | Not Rated |
| Sherry Lake Dam Stevens County | 12 | 1952 | Low | Not Rated |
| Shillapoo Lake Dikes Clark County | 10 | 2007 | Low | Not Rated |
| Shoecraft Lake Outlet Snohomish County | 10 | 1952 | Low | Not Rated |
| Silver Lake Dam Cowlitz County | 15 | 1971 | Low | Not Rated |
| Simplot Lrar Lagoon Grant County | 24 | 2006 | Low | Not Rated |
| Sims Dam Douglas County | 7 | 1960 | Low | Not Rated |
| Skagit Lake Dam Skagit County | 19 | 1971 | Low | Not Rated |
| 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 |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.