Columbia Marsh Unit #2 Dam
Columbia Marsh Unit #2 Dam is an earth dam located in Grant County, Washington, built in 1957. It carries a Low hazard potential classification and has a fair condition assessment.
About Columbia Marsh Unit #2 Dam
The primary purpose of Columbia Marsh Unit #2 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 15 feet tall and stretches 533 feet across, creates a reservoir covering 31 acres, has a maximum storage capacity of 207 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1957, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. 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 | 46.93667, -119.24166 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 533 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 207 acre-ft |
| Max Storage | 207 acre-ft |
| Normal Storage | 117 acre-ft |
| Surface Area | 31 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 2,884 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | US FISH AND WILDLIFE SERVICE |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 09/25/2012 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA10011 |
| Federal ID | WA10011 |
| More Info | State Dam Safety Program |