Upper Big Nemaha 9-B Reservoir Report
Last Updated: December 5, 2025
Upper Big Nemaha 9-B is a local government-owned dam in Gage, Nebraska, designed by USDA NRCS and regulated by the Nebraska Department of Natural Resources.
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Summary
Completed in 1991, this earth dam stands at a height of 36 feet and serves multiple purposes, including flood risk reduction. With a storage capacity of 1,789 acre-feet and a drainage area of 4.2 square miles, this structure plays a vital role in water resource management in the region.
Located on the Mid Branch of the Big Nemaha River, Upper Big Nemaha 9-B has a low hazard potential and is currently assessed to be in fair condition. Although the dam has a spillway type unspecified, it has a maximum discharge capacity of 2,581 cubic feet per second. The dam's inspection frequency is every five years, with the last assessment conducted in May 2020, indicating a commitment to ensuring the structure's safety and effectiveness in mitigating flood risks and managing water resources in the area.
With its strategic placement and design features, Upper Big Nemaha 9-B contributes significantly to water resource management and flood risk reduction efforts in Gage, Nebraska. As a crucial piece of infrastructure, this earth dam, managed by local government authorities and the USDA NRCS, plays a vital role in protecting the surrounding community from potential water-related hazards. The dam's fair condition and regular inspections underscore the commitment to maintaining its functionality and ensuring the safety of residents and properties downstream.
Year Completed |
1991 |
Dam Length |
1230 |
Dam Height |
36 |
River Or Stream |
MID BR BIG NEMAHA RIVER |
Primary Dam Type |
Earth |
Surface Area |
58 |
Hydraulic Height |
35 |
Drainage Area |
4.2 |
Nid Storage |
1789 |
Structural Height |
41 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
41 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
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