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 1–25 of 98
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Youngs Lake Cascades Dam King County | 16 | 1950 | Significant | Satisfactory |
| Wright Creek Stormwater Pond Dam Kitsap County | 14 | 2006 | Significant | Satisfactory |
| West Richland Sewage Lagoon North Benton County | 7 | 1961 | Significant | Fair |
| West Fork Dam Grays Harbor County | 16 | 1956 | Significant | Fair |
| Western Nuclear Tailings Pond Stevens County | 62 | 1977 | Significant | Satisfactory |
| Watts Bros Organic Dairy Lagoon 3 Benton County | 21 | 2007 | Significant | Fair |
| Watts Bros Organic Dairy Lagoon 2 Benton County | 21 | 2007 | Significant | Fair |
| Watts Bros Organic Dairy Lagoon 1 Benton County | 21 | 2007 | Significant | Fair |
| Van Stone Tailings Dam Stevens County | 90 | 1970 | Significant | Poor |
| Valley View Dairy Waste Pond Skagit County | 13 | 2003 | Significant | Poor |
| Tyson Fresh Meats Pasco Brine Pond 8 Walla Walla County | 17 | 2010 | Significant | Satisfactory |
| Tyson Fresh Meats Lagoons 1 2 3 Walla Walla County | 8 | 1980 | Significant | Satisfactory |
| Tyson Fresh Meats Brine Pond 7 Walla Walla County | 9 | 1995 | Significant | Satisfactory |
| Tree Top Prosser Lagoons 2 & 3 Benton County | 18 | 1991 | Significant | Fair |
| The Vineyards Water Storage Pond Yakima County | 16 | — | Significant | Not Rated |
| Sylvia Lake Dam Pierce Co Pierce County | 16 | 1963 | Significant | Fair |
| Sylvia Lake Dam Grays Harbor Cnty Grays Harbor County | 23 | 1918 | Significant | Poor |
| Sunny Dene Dairy Waste Pond Yakima County | 21 | 2004 | Significant | Fair |
| Ste Michelle Canoe Ridge Evaporation Pond Benton County | 14 | 2012 | Significant | Satisfactory |
| Spoils Pond Dam Grays Harbor County | 14 | 1970 | Significant | Not Rated |
| Slavic Lake Dam Pierce County | 13 | 1990 | Significant | Poor |
| Simplot Feeders Waste Pond No1 Walla Walla County | 15 | 1973 | Significant | Fair |
| Seaway Center Stormwater Detention Dam Snohomish County | 39 | 1989 | Significant | Satisfactory |
| Seatac Airport Se Pond King County | 9 | 2007 | Significant | Satisfactory |
| Samish Wd Sewage Lagoons Skagit County | 8 | 1974 | Significant | Fair |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.