Upper Big Nemaha 25-C (Rehab) Reservoir Report
Last Updated: December 6, 2025
Upper Big Nemaha 25-C (Rehab) is a vital earth dam located in Gage County, Nebraska, designed by USDA NRCS and completed in 1974 for the primary purpose of flood risk reduction.
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Summary
This dam stands at a height of 41.5 feet, with a hydraulic height of 41.4 feet and a structural height of 50.4 feet. It has a NID storage capacity of 3690.2 acre-feet and serves to protect the surrounding area with its normal storage capacity of 487.4 acre-feet.
Managed by the Nebraska Department of Natural Resources, this dam on Jakes Creek plays a crucial role in mitigating flood risks and ensuring the safety and security of the residents in the region. The dam has a hazard potential classified as high, but its condition assessment in 2020 deemed it satisfactory, highlighting its operational effectiveness. Regular inspections are conducted, with the last one taking place in September 2020, to ensure the structural integrity and functionality of the dam.
With its strategic location and impressive specifications, Upper Big Nemaha 25-C (Rehab) stands as a key infrastructure for flood control in the area. As a part of the local government's initiatives for water resource management, this dam serves as a critical asset in safeguarding the community against potential flood events. Its successful rehabilitation and ongoing regulatory oversight demonstrate a commitment to maintaining a resilient water infrastructure system that addresses the challenges posed by climate change and evolving environmental conditions.
Year Completed |
1974 |
Dam Length |
1500 |
Dam Height |
41.5 |
River Or Stream |
JAKES CREEK |
Primary Dam Type |
Earth |
Surface Area |
79.74 |
Hydraulic Height |
41.4 |
Drainage Area |
9.25 |
Nid Storage |
3690.2 |
Structural Height |
50.4 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
50 |
Seasonal Comparison
Weather Forecast
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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 25-C (Rehab)