Antelope Creek 40-B Reservoir Report
Last Updated: December 12, 2025
Antelope Creek 40-B is a vital flood risk reduction structure located in Sheridan County, Nebraska.
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Summary
Constructed in 1964 by the USDA NRCS, this earth dam stands at a height of 32 feet and spans a length of 1800 feet, providing essential protection to the surrounding area. With a storage capacity of 8655 acre-feet and a drainage area of 36.3 square miles, this dam plays a crucial role in managing water flow and mitigating potential flooding events along Antelope Creek.
Managed by the Nebraska Department of Natural Resources, Antelope Creek 40-B is subject to regular inspections to ensure its structural integrity and functionality. Despite its high hazard potential, the dam has been assessed as satisfactory, with a condition assessment conducted as recently as June 2020. With a primary purpose of flood risk reduction, this structure serves as a key component of the local water resource management system, safeguarding communities and infrastructure from the impacts of extreme weather events.
Situated within the St. Paul District and under the jurisdiction of the NE DNR, Antelope Creek 40-B stands as a testament to the collaborative efforts between local government agencies and federal partners in promoting water resource resilience. As climate change continues to pose challenges to water management systems, structures like Antelope Creek 40-B play a critical role in enhancing community safety and environmental sustainability in the face of evolving weather patterns and increased flood risks.
Year Completed |
1964 |
Dam Length |
1800 |
Dam Height |
32 |
River Or Stream |
ANTELOPE CREEK |
Primary Dam Type |
Earth |
Surface Area |
9 |
Hydraulic Height |
32 |
Drainage Area |
36.3 |
Nid Storage |
8655 |
Structural Height |
32 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
32 |
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 40-B