Antelope Creek 20-A Reservoir Report
Last Updated: December 13, 2025
Antelope Creek 20-A is a crucial flood risk reduction structure located in Sheridan, Nebraska.
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Summary
Constructed in 1964 by the USDA NRCS, this earth dam stands at a height of 24 feet and has a length of 562 feet. With a storage capacity of 450 acre-feet and a maximum discharge rate of 3,400 cubic feet per second, it plays a vital role in managing water flow in the area. The dam is state-regulated by the Nebraska Department of Natural Resources, with regular inspections ensuring its structural integrity.
The primary purpose of Antelope Creek 20-A is flood risk reduction, serving as a critical infrastructure for the local government. Despite its high hazard potential, the dam has been assessed as satisfactory in condition, with the last inspection conducted in June 2020. The dam's location in the TR-Antelope Creek watershed highlights its significance in protecting the surrounding areas from potential flooding events. With its efficient design and operation, Antelope Creek 20-A continues to play a key role in water resource management and climate resilience efforts in the region.
Overall, Antelope Creek 20-A stands as a testament to effective water resource management and infrastructure development in Nebraska. Managed by the Natural Resources Conservation Service, this earth dam not only provides flood risk reduction but also contributes to water storage and flow regulation in the area. With state regulation and regular inspections in place, Antelope Creek 20-A remains a vital component of the local government's strategy for mitigating the impact of extreme weather events and ensuring the safety and resilience of the community.
Year Completed |
1964 |
Dam Length |
562 |
Dam Height |
24 |
River Or Stream |
TR-ANTELOPE CREEK |
Primary Dam Type |
Earth |
Surface Area |
11 |
Hydraulic Height |
24 |
Drainage Area |
1.7 |
Nid Storage |
450 |
Structural Height |
24 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
24 |
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.
Antelope Creek 20-A