Upper Big Nemaha 12-B
Key Takeaway
Upper Big Nemaha 12-B is classified as low hazard in Nebraska. It was completed in 1994 and is 32 years old. Its primary use is other.
Physical Details
| Dam Height | 29 ft (taller than 63.8% in NE) |
| Dam Length | 1,231 ft |
| Dam Type | Earth |
| Max Storage | 1.2K acre-ft |
| Normal Storage | 251 acre-ft |
| Surface Area | 94 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 632 cfs |
| Year Completed | 1994 (32 years old) |
| NID ID | NE02365 |
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
Nearby Dams
Upper Big Nemaha G-18
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Low Hazard 25 ftUpper Big Nemaha 12-A
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Low Hazard 23 ftUpper Big Nemaha 11-A
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High Hazard 36 ftUpper Big Nemaha 13-C
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Low Hazard 30 ftHelmink Dam
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Significant Hazard 21 ftUpper Salt Creek 11-4
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Low Hazard 21 ftFrequently Asked Questions
What is the hazard classification of Upper Big Nemaha 12-B?
Upper Big Nemaha 12-B 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 12-B?
Upper Big Nemaha 12-B 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 12-B built?
Upper Big Nemaha 12-B was completed in 1994, making it 32 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 12-B?
Upper Big Nemaha 12-B 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 12-B?
Upper Big Nemaha 12-B has a dam height of 29 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 12-B last inspected?
Upper Big Nemaha 12-B was last inspected on June 14, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.