Upper Big Nemaha G-20
Key Takeaway
Upper Big Nemaha G-20 is classified as low hazard in Nebraska. It was completed in 1978 and is 48 years old. Its primary use is other.
Physical Details
| Dam Height | 27 ft (taller than 55% in NE) |
| Dam Length | 437 ft |
| Dam Type | Earth |
| Max Storage | 43 acre-ft |
| Normal Storage | 17 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 623 cfs |
| Year Completed | 1978 (48 years old) |
| NID ID | NE01594 |
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
Nemaha Natural Resources District
Local Government
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Low Hazard 36 ftUpper Big Nemaha J-34
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Low Hazard 25 ftFrequently Asked Questions
What is the hazard classification of Upper Big Nemaha G-20?
Upper Big Nemaha G-20 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 Upper Big Nemaha G-20?
Upper Big Nemaha G-20 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 G-20 built?
Upper Big Nemaha G-20 was completed in 1978, making it 48 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 G-20?
Upper Big Nemaha G-20 serves the following purposes: Other, 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 G-20?
Upper Big Nemaha G-20 has a dam height of 27 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 G-20 last inspected?
Upper Big Nemaha G-20 was last inspected on June 16, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.