Upper Big Nemaha G-24 Reservoir Report
Last Updated: December 5, 2025
Upper Big Nemaha G-24 is a crucial water management structure located in Gage County, Nebraska, along the TR-MID BR Big Nemaha River.
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Summary
Built in 1982 by the USDA NRCS, this earth dam stands at a height of 30 feet and spans 668 feet in length. With a storage capacity of 224 acre-feet and a drainage area of 0.6 square miles, it plays a vital role in flood risk reduction and other purposes in the region.
Managed by the local government and regulated by the Nebraska Department of Natural Resources, Upper Big Nemaha G-24 has a significant hazard potential but is currently in satisfactory condition as of the last inspection in April 2018. The dam is equipped with a spillway and has a maximum discharge capacity of 192 cubic feet per second. Its location in Adams and association with the Omaha District highlight its importance in water resource management and climate resilience efforts in the area.
For water resource and climate enthusiasts, Upper Big Nemaha G-24 serves as a focal point for understanding the intersection of infrastructure, environmental protection, and community safety. As a key component of the local water management system, this earth dam embodies the collaboration between government agencies, designers, and stakeholders in ensuring the resilience of the region against potential hazards. With its history of construction and ongoing regulatory oversight, Upper Big Nemaha G-24 stands as a testament to the proactive approach taken in safeguarding water resources in Nebraska.
Year Completed |
1982 |
Dam Length |
668 |
Dam Height |
29 |
River Or Stream |
TR-MID BR BIG NEMAHA RIVER |
Primary Dam Type |
Earth |
Surface Area |
11 |
Hydraulic Height |
27 |
Drainage Area |
0.6 |
Nid Storage |
224 |
Structural Height |
30 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
30 |
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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