Columbia Marsh Unit #1 Dam
Key Takeaway
Columbia Marsh Unit #1 Dam is classified as low hazard in Washington. It was completed in 1958 and is 68 years old. Its primary use is fish and wildlife pond.
Physical Details
| Dam Height | 20 ft (taller than 27.2% in WA) |
| Dam Length | 2,500 ft |
| Dam Type | Earth |
| Max Storage | 570 acre-ft |
| Normal Storage | 325 acre-ft |
| Surface Area | 58 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 1,018 cfs |
| Year Completed | 1958 (68 years old) |
| NID ID | WA00316 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
US FISH AND WILDLIFE SERVICE
Federal Government
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Low HazardFrequently Asked Questions
What is the hazard classification of Columbia Marsh Unit #1 Dam?
Columbia Marsh Unit #1 Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Columbia Marsh Unit #1 Dam?
Columbia Marsh Unit #1 Dam is owned by US FISH AND WILDLIFE SERVICE (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Columbia Marsh Unit #1 Dam built?
Columbia Marsh Unit #1 Dam was completed in 1958, making it 68 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Columbia Marsh Unit #1 Dam?
Columbia Marsh Unit #1 Dam serves the following purposes: Fish And Wildlife Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Columbia Marsh Unit #1 Dam?
Columbia Marsh Unit #1 Dam has a dam height of 20 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Columbia Marsh Unit #1 Dam last inspected?
Columbia Marsh Unit #1 Dam was last inspected on September 25, 2012. Inspection dates indicate when a formal review occurred, not the results of that inspection.