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 76–98 of 98
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Coulee City Wastewater Lagoon Cell 4 Grant County | 15 | 2008 | Significant | Satisfactory |
| Conner Jarvis East Pond King County | 11 | 2018 | Significant | Satisfactory |
| Connell Wastewater Lagoons Franklin County | 20 | 2000 | Significant | Fair |
| Connell Wastewater Lagoon 5 Franklin County | 8 | 2009 | Significant | Fair |
| Connell Wastewater Lagoon 4 Franklin County | 10 | 2009 | Significant | Fair |
| Connell Wastewater Lagoon 1a Franklin County | 23 | 2009 | Significant | Fair |
| Chelan Chelan County | 66 | 1927 | Significant | Fair |
| Chehalis Regional Water Reclamation Pond Lewis County | 17 | 2005 | Significant | Satisfactory |
| Centralia Coal Mine Dam No 3c South Lewis County | 69 | 1987 | Significant | Satisfactory |
| Centralia Coal Mine Dam No 3c North Lewis County | 134 | 1987 | Significant | Satisfactory |
| Centralia Coal Mine Dam No 3c East Lewis County | 21 | 1987 | Significant | Satisfactory |
| Centralia Coal Mine Dam No 3b Lewis County | 140 | 1980 | Significant | Fair |
| Cedar Hills Landfill Csw Pond King County | 14 | 2016 | Significant | Fair |
| Butterworth Dam Pierce County | 60 | 1949 | Significant | Poor |
| Bueler Dairy Waste Storage Pond Snohomish County | 15 | 2000 | Significant | Fair |
| Bosma Old Pond 1 Yakima County | 9 | 2000 | Significant | Fair |
| Beth Lake Okanogan County | 16 | — | Significant | Not Rated |
| Barlond Dairy Lagoon Snohomish County | 11 | 1990 | Significant | Fair |
| Agrinw Spaw Pond Benton County | — | — | Significant | Not Rated |
| Agrinw Feedlot Fresh Water Pond Benton County | — | — | Significant | Not Rated |
| Agreserves Plymouth Wastewater Storage Pond Benton County | 19 | 2023 | Significant | Not Rated |
| 60th Street Stormwater Detention Dam Snohomish County | 104 | 1988 | Significant | Satisfactory |
| 204th Street Stormwater Detention Basin King County | 9 | 2001 | 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.