Upper Big Nemaha 25-C
Key Takeaway
Upper Big Nemaha 25-C is classified as high hazard in Nebraska. It was completed in 1974 and is 52 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 | 42 ft (taller than 92.2% in NE) |
| Dam Length | 1,500 ft |
| Dam Type | Earth |
| Max Storage | 3.7K acre-ft |
| Normal Storage | 487 acre-ft |
| Surface Area | 80 acres |
| Drainage Area | 9 sq mi |
| Max Discharge | 16,281 cfs |
| Year Completed | 1974 (52 years old) |
| NID ID | NE00914 |
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
Nearby Dams
Upper Big Nemaha 7-A
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High Hazard 37 ftUpper Big Nemaha G-13
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Low Hazard 30 ftUpper Big Nemaha G-14
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Low Hazard 29 ftUpper Big Nemaha 6-A
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Significant Hazard 41 ftUpper Big Nemaha G-18a
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Low Hazard 24 ftUpper Big Nemaha G-12
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Low Hazard 21 ftUpper Big Nemaha G-25
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Low Hazard 25 ftUpper Big Nemaha G-34
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Low Hazard 18 ftFrequently Asked Questions
What is the hazard classification of Upper Big Nemaha 25-C?
Upper Big Nemaha 25-C 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 25-C?
Upper Big Nemaha 25-C 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 25-C built?
Upper Big Nemaha 25-C was completed in 1974, making it 52 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 25-C?
Upper Big Nemaha 25-C 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 25-C?
Upper Big Nemaha 25-C has a dam height of 42 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 25-C last inspected?
Upper Big Nemaha 25-C was last inspected on June 27, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.