Mcdonald Dam is an earth dam located in Grant County, Washington, built in 1924. It carries a Low hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 880 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 Mcdonald Dam
The primary purpose of Mcdonald 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 Mcdonald-moon Farms Inc (private). It impounds the Tr-crab Creek.
The dam stands 12 feet tall and stretches 880 feet across, creates a reservoir covering 200 acres, has a maximum storage capacity of 200 acre-feet, and collects water from a drainage area of 27 square miles. Completed in 1924, the structure is over a century 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. The most recent inspection on record was 10/10/1999. That was over 27 years ago.
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Location
| State | Washington |
| County | Grant |
| River/Stream | Tr-crab Creek |
| Coordinates | 47.64837, -119.10890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Length | 880 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 200 acre-ft |
| Max Storage | 200 acre-ft |
| Normal Storage | 200 acre-ft |
| Surface Area | 200 acres |
| Drainage Area | 27 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Mcdonald-moon Farms Inc |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/10/1999 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00017 |
| Federal ID | WA00017 |
| More Info | State Dam Safety Program |