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 101–125 of 312
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Rearing Pond Dike Grant County | 12 | 1964 | Low | Not Rated |
| Ravensdale Pit King County | 18 | 1972 | Low | Not Rated |
| Rainbow Lake Dam Columbia County | 14 | 1955 | Low | Not Rated |
| Queens Bog Dam King County | 12 | 1987 | Low | Not Rated |
| Quadrant Lake No 1 King County | 8 | 1994 | Low | Not Rated |
| Pumping Pond Dike Whatcom County | 22 | 1960 | Low | Satisfactory |
| Prosser Diversion Dam Benton County | 9 | 1904 | Low | Not Available |
| Powell Dam Lewis County | 11 | 1963 | Low | Not Rated |
| Potters Pond Dam Stevens County | 12 | 1959 | Low | Fair |
| Port of Moses Lake Lagoon Grant County | 30 | 1999 | Low | Not Rated |
| Ponderay Newsprint Mill Settling Lagoon Pend Oreille County | 24 | 1989 | Low | Not Rated |
| Pacific Nw Sugar CO Sedimentation Pond Grant County | 15 | 1998 | Low | Not Rated |
| Pacific Nw Sugar CO Condensation Pond Grant County | 19 | 1998 | Low | Not Rated |
| Othello Primary Treatment Pond 1b Adams County | 16 | 1982 | Low | Not Rated |
| Othello Primary Treatment Pond 1a Adams County | 27 | 1982 | Low | Not Rated |
| Orchards Block 92 Dam Walla Walla County | 22 | 1992 | Low | Not Rated |
| Oak Harbor Wastewater Lagoon Sw Cell Island County | 8 | 1990 | Low | Not Rated |
| Oak Harbor Wastewater Lagoon Nw Cell Island County | 8 | 1990 | Low | Not Rated |
| Nielsen Dam A Snohomish County | 15 | 1950 | Low | Not Rated |
| Nestle Potato Effluent Lagoon Grant County | 32 | 1994 | Low | Not Rated |
| Nada Dam Chelan County | 9 | 1939 | Low | Satisfactory |
| Mossyrock - Saddle Dike Lewis County | 23 | 1968 | Low | Satisfactory |
| Moses Lake South Dam Grant County | 20 | 1961 | Low | Not Available |
| Moses Lake North Dam Grant County | 19 | 1930 | Low | Not Rated |
| Morse Lake Overflow Dike King County | 30 | 1904 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.