Upper Big Nemaha 1-B41
Key Takeaway
Upper Big Nemaha 1-B41 is classified as significant hazard in Nebraska. It was completed in 1982 and is 44 years old. Its primary use is flood risk reduction. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 43 ft (taller than 93% in NE) |
| Dam Length | 1,416 ft |
| Dam Type | Earth |
| Max Storage | 893 acre-ft |
| Normal Storage | 259 acre-ft |
| Surface Area | 40 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 569 cfs |
| Year Completed | 1982 (44 years old) |
| NID ID | NE02146 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
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 J-15
Johnson, NE
Low Hazard 25 ftUpper Big Nemaha J-15a
Johnson, NE
Low Hazard 22 ftSouth Branch 12
Johnson, NE
Low Hazard 29 ftSouth Branch 13
Johnson, NE
Low Hazard 26 ftUpper Big Nemaha J-42
Johnson, NE
Low Hazard 24 ftSouth Branch 45
Otoe, NE
Low Hazard 34 ftUpper Big Nemaha 2-A
Johnson, NE
Low Hazard 35 ftSouth Branch 3-3
Otoe, NE
Low Hazard 29 ftFrequently Asked Questions
What is the hazard classification of Upper Big Nemaha 1-B41?
Upper Big Nemaha 1-B41 is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. 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 1-B41?
Upper Big Nemaha 1-B41 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 1-B41 built?
Upper Big Nemaha 1-B41 was completed in 1982, making it 44 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 1-B41?
Upper Big Nemaha 1-B41 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 1-B41?
Upper Big Nemaha 1-B41 has a dam height of 43 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 1-B41 last inspected?
Upper Big Nemaha 1-B41 was last inspected on May 5, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.