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 76–100 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Tuck Lake Dam King County | 47 | 1966 | High | Fair |
| Trout Lake Storage Dam San Juan County | 37 | 1929 | High | Fair |
| Trossachs Detention Pond Pc-3 King County | 15 | 1999 | High | Satisfactory |
| Trossachs Detention Pond Pc-2 King County | 21 | 2002 | High | Satisfactory |
| Trophy Ponds Dam Snohomish County | 16 | 1984 | High | Fair |
| Tri Mountain Estates Dam Clark County | 32 | 1953 | High | Satisfactory |
| Tree Top Selah Wastewater Lagoon Yakima County | 15 | 1991 | Low | Not Rated |
| Tree Top Prosser Lagoons 2 & 3 Benton County | 18 | 1991 | Significant | Fair |
| Tolt River - South Fork King County | 200 | 1962 | High | Fair |
| Timberlakes Dam Mason County | 29 | 1968 | High | Satisfactory |
| Tieton Dam Yakima County | 319 | 1925 | High | Not Available |
| Three Rivers Mill Pond Dam Snohomish County | 10 | 1946 | Low | Not Rated |
| Three Lakes Reservoir Dam Chelan County | 9 | 1908 | Low | Not Rated |
| Thorald Dam San Juan County | 19 | 1988 | Low | Not Rated |
| The Vineyards Water Storage Pond Yakima County | 16 | — | Significant | Not Rated |
| Texas Pond Skagit County | 14 | 1970 | Low | Not Rated |
| Tesoro Water Storage Reservoir Skagit County | 11 | 1958 | High | Fair |
| Tempo Lake Dam Thurston County | 10 | 1960 | Low | Not Rated |
| Telegraph Road Stormwater Detention Dam Whatcom County | 14 | 1988 | High | Fair |
| Teal Duck Slough Dam Pacific County | 8 | 1960 | Low | Not Rated |
| Tapps Lake Dike No 9 Pierce County | 15 | 1911 | High | Satisfactory |
| Tapps Lake Dike No 8 Pierce County | 20 | 1911 | High | Satisfactory |
| Tapps Lake Dike No 6 Pierce County | 28 | 1911 | High | Satisfactory |
| Tapps Lake Dike No 5 Pierce County | 28 | 1911 | High | Satisfactory |
| Tapps Lake Dike No 4 Pierce County | 48 | 1911 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.