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 401–425 of 817
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Loutsis Dam King County | 22 | 1970 | Low | Satisfactory |
| Louise Lake Dam Whatcom County | 14 | 1972 | High | Satisfactory |
| Loreene Lake Dam King County | 19 | 1963 | Low | Not Rated |
| Lords Lake North Dam Jefferson County | 42 | 1957 | High | Satisfactory |
| Lords Lake East Dam Jefferson County | 42 | 1956 | High | Poor |
| Loon Lake Storage Lagoon No 3 Stevens County | 13 | 1998 | High | Satisfactory |
| Loon Lake Storage Lagoon No 2 Stevens County | 12 | 1986 | High | Satisfactory |
| Loon Lake Storage Lagoon No 1 Stevens County | 12 | 1986 | High | Satisfactory |
| Loon Lake Control Structure Stevens County | 8 | 1951 | Low | Fair |
| Loon Lake Aeration Lagoon Stevens County | 12 | 1986 | High | Satisfactory |
| Longview Sewage Lagoon No 4 Cowlitz County | 12 | 1987 | Low | Not Rated |
| Longview Sewage Lagoon No 3 Cowlitz County | 10 | 1987 | Low | Not Rated |
| Longview Sewage Lagoon No 2 Cowlitz County | 11 | 1986 | Low | Not Rated |
| Longview Sewage Lagoon No 1 Cowlitz County | 9 | 1986 | Low | Not Rated |
| Long Lake East Dam Spokane County | 25 | 1960 | Low | Fair |
| Long Lake Crescent Lincoln County | 108 | 1915 | High | Satisfactory |
| Longeway Dam Ferry County | 11 | 1970 | Low | Not Rated |
| Long Bell Mill Pond Dam Lewis County | 18 | 1943 | Low | Not Rated |
| Lohrer Dam Clallam County | 5 | 1974 | High | Satisfactory |
| Loers Dam Island County | 9 | 1958 | Low | Not Rated |
| Locke Dam Pend Oreille County | 25 | 1973 | High | Satisfactory |
| Little Twin Lakes Dam Mason County | 25 | 1966 | Low | Not Rated |
| Little Sweden Dam Stevens County | 7 | 1986 | Low | Not Rated |
| Little Green Lake Dam Okanogan County | 11 | 1959 | High | Fair |
| Little Goose Lock and Dam Columbia County | 226 | 1970 | High | Not Available |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.