Upper Big Nemaha 6-A Reservoir Report
Last Updated: December 6, 2025
Upper Big Nemaha 6-A is a vital earth dam located in Gage, Nebraska, designed by USDA NRCS and completed in 1978 for flood risk reduction along the TR-MID BR Big Nemaha River.
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Summary
This local government-owned structure stands at a height of 43 feet and has a storage capacity of 633 acre-feet, serving a drainage area of 1.9 square miles. With a significant hazard potential and satisfactory condition assessment, the dam is regulated and inspected by the Nebraska Department of Natural Resources to ensure its effectiveness in managing floodwaters and protecting the surrounding community.
The dam's primary purpose of flood risk reduction highlights its importance in mitigating potential disasters and safeguarding the area from the impacts of extreme weather events. Situated in a picturesque location with a surface area of 22 acres, Upper Big Nemaha 6-A plays a crucial role in managing water flow and maintaining the ecological balance of the region. Its stone core and soil foundation contribute to its structural integrity, while the presence of state-regulated permitting, inspection, and enforcement mechanisms ensures its continued operation and safety for the community.
As water resource and climate enthusiasts, the data on Upper Big Nemaha 6-A provides valuable insights into the infrastructure and management of water resources in Nebraska. From its construction by the Natural Resources Conservation Service to its regular inspections and hazard assessments, this dam exemplifies the intersection of engineering, environmental stewardship, and public safety in addressing the challenges of water management and climate resilience. The ongoing monitoring and maintenance of Upper Big Nemaha 6-A reflect a proactive approach to sustainability and disaster preparedness in the face of changing climate patterns and increasing water-related risks.
Year Completed |
1978 |
Dam Length |
922 |
Dam Height |
41 |
River Or Stream |
TR-MID BR BIG NEMAHA RIVER |
Primary Dam Type |
Earth |
Surface Area |
22 |
Hydraulic Height |
41 |
Drainage Area |
1.9 |
Nid Storage |
633 |
Structural Height |
43 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
43 |
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.
Upper Big Nemaha 6-A