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 251–275 of 312
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| 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 |
| Soda Lake Dike Grant County | 59 | 1952 | Low | Not Available |
| South Aeration Stabilization Basin Lady Island Clark County | 15 | 1977 | Low | Satisfactory |
| South Bank Dairy Lagoon Dam Lewis County | 40 | 1980 | Low | Not Rated |
| Sowers Reservoir Dam Stevens County | 18 | 1958 | Low | Not Rated |
| Spectacle Lake Dike Okanogan County | 25 | 1969 | Low | Not Available |
| Spencer Lake San Juan County | 42 | 1983 | Low | Satisfactory |
| Sportsman Lake Dam San Juan County | 7 | 1960 | Low | Not Rated |
| Springdale Wastewater Pond System Stevens County | 11 | 1995 | Low | Not Rated |
| Squires Lake Dam Whatcom County | 15 | 1960 | Low | Not Rated |
| Stanwood Wastewater Pond Snohomish County | 8 | 1980 | Low | Not Rated |
| Summit Lake Dam Thurston County | 7 | 1955 | Low | Not Rated |
| Sundstrom Dam No 1 San Juan County | 16 | 1970 | Low | Not Rated |
| Sundstrom Dam No 2 San Juan County | 28 | 1984 | Low | Not Rated |
| Sunheaven Farms Reservoir Benton County | 13 | 1986 | Low | Not Rated |
| Sunnyside Indust Wastewater Lag 1 2 & 3 Yakima County | 17 | 1992 | Low | Not Rated |
| Swift No 2 Hydroelectric Project Cowlitz County | 121 | 1959 | Low | Satisfactory |
| Swofford Pond Lewis County | 26 | — | Low | Satisfactory |
| Tacoma Sportsman Pond Pend Oreille County | 10 | 1954 | Low | Not Rated |
| Taggares Dam No 1 Adams County | 14 | 1968 | Low | Not Rated |
| Taggares Dam No 2 Adams County | 14 | 1968 | Low | Not Rated |
| Tapps Lake Dike No 14 Pierce County | 256 | 1911 | Low | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.