Columbia Marsh Unit #1 Dam
Columbia Marsh Unit #1 Dam is an earth dam located in Grant County, Washington, built in 1958. It carries a Low hazard potential classification and has a poor condition assessment.
About Columbia Marsh Unit #1 Dam
The primary purpose of Columbia Marsh Unit #1 Dam is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Us Fish And Wildlife Service (federal). It impounds the Lower Crab Creek.
The dam stands 25 feet tall and stretches 2,500 feet across, creates a reservoir covering 58 acres, has a maximum storage capacity of 570 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1958, 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 09/25/2012. That was over 13 years ago.
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Location
| State | Washington |
| County | Grant |
| River/Stream | Lower Crab Creek |
| Coordinates | 46.95834, -119.26000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 20 ft |
| Dam Length | 2,500 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 570 acre-ft |
| Max Storage | 570 acre-ft |
| Normal Storage | 325 acre-ft |
| Surface Area | 58 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 1,018 cfs |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | US FISH AND WILDLIFE SERVICE |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/25/2012 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00316 |
| Federal ID | WA00316 |
| More Info | State Dam Safety Program |