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 26–50 of 98
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Samish Wd Sewage Lagoon No. 1 Skagit County | 8 | 1974 | Significant | Fair |
| Rosalia Sewage Lagoon Whitman County | 10 | 1989 | Significant | Fair |
| Rockford Wastewater Pond No. 3 Spokane County | 24 | 1999 | Significant | Satisfactory |
| Ritzville Wastewater Lagoons Adams County | 9 | 2000 | Significant | Fair |
| Quincy Sludge Storage Lagoon System Lagoons 1 2 and 3 Grant County | 15 | 1986 | Significant | Fair |
| Quincy Brine Evaporation Ponds Grant County | 11 | 1989 | Significant | Fair |
| Quincy Aerated Lagoon No 2 Grant County | 12 | 1987 | Significant | Not Rated |
| Quincy Aerated Lagoon No 1 Grant County | 12 | 1987 | Significant | Not Rated |
| Quadrant East Campus Parcel 1 King County | 11 | 2000 | Significant | Satisfactory |
| Prosser Warehouse Treatment Lagoon Benton County | 14 | 2012 | Significant | Satisfactory |
| Pigeon Creek No 1 Stormwater Detention D Snohomish County | 22 | 1990 | Significant | Fair |
| Pend Oreille Mine Nw Tailings Dam Pend Oreille County | 67 | 2003 | Significant | Satisfactory |
| Pend Oreille Mine Ne Tailings Dam Pend Oreille County | 72 | 2003 | Significant | Satisfactory |
| Pasco Industrial Wastewater System Franklin County | 15 | 1995 | Significant | Satisfactory |
| North Ranch Storage Lagoon Mason County | 18 | 2018 | Significant | Satisfactory |
| North Bay Water Reclamation Pond 1 Mason County | 14 | 2000 | Significant | Satisfactory |
| North Aeration Stabilization Basin Lady Island Clark County | 20 | 1977 | Significant | Satisfactory |
| Nookachamps Hills Dam Skagit County | 54 | 1969 | Significant | Poor |
| Miller Creek Regional Detention Facility King County | 16 | 1992 | Significant | Satisfactory |
| Mill Creek Storage Dam - Diversion Dam Walla Walla County | 14 | 1942 | Significant | Not Available |
| Metaline Falls Wastewater Lagoon No 3 Pend Oreille County | 11 | 1963 | Significant | Fair |
| Lincoln Rock S.P. Evaporative Lagoons Douglas County | 15 | 1981 | Significant | Satisfactory |
| Liberty Acres Lagoon 7 Yakima County | 6 | 2000 | Significant | Fair |
| Liberty Acres Lagoon 3 Yakima County | 7 | 1990 | Significant | Fair |
| Lamb Weston Richland Lrad Lagoon Benton County | 29 | 2017 | Significant | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.