Mckay Dam is an earth dam located in Douglas County, Washington, built in 1961. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 173 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Mckay Dam
The primary purpose of Mckay Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Polson Family LLC, E & J (private). It impounds the Tr-columbia River near Douglas.
The dam stands 15 feet tall and stretches 173 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 120 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1961, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Washington |
| County | Douglas |
| Nearest City | Douglas |
| River/Stream | Tr-columbia River |
| Coordinates | 47.69668, -120.06285 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Length | 173 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 120 acre-ft |
| Max Storage | 120 acre-ft |
| Normal Storage | 19 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 39 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Polson Family LLC, E & J |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00018 |
| Federal ID | WA00018 |
| More Info | State Dam Safety Program |