Upper Big Nemaha 7-A
Key Takeaway
Upper Big Nemaha 7-A is classified as high hazard in Nebraska. It was completed in 1970 and is 56 years old. Its primary use is flood risk reduction. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 37 ft (taller than 86.1% in NE) |
| Dam Length | 843 ft |
| Dam Type | Earth |
| Max Storage | 908 acre-ft |
| Normal Storage | 129 acre-ft |
| Surface Area | 24 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 6,150 cfs |
| Year Completed | 1970 (56 years old) |
| NID ID | NE00993 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Nemaha Natural Resources District
Local Government
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Low Hazard 24 ftFrequently Asked Questions
What is the hazard classification of Upper Big Nemaha 7-A?
Upper Big Nemaha 7-A is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Upper Big Nemaha 7-A?
Upper Big Nemaha 7-A is owned by Nemaha Natural Resources District (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Upper Big Nemaha 7-A built?
Upper Big Nemaha 7-A was completed in 1970, making it 56 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 Upper Big Nemaha 7-A?
Upper Big Nemaha 7-A serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Upper Big Nemaha 7-A?
Upper Big Nemaha 7-A has a dam height of 37 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 Upper Big Nemaha 7-A last inspected?
Upper Big Nemaha 7-A was last inspected on June 27, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.