Brenner Reservoir Report
Nearby: Boggy East No. 1 Beardsley
Last Updated: December 6, 2025
Brenner is a privately owned earth dam located in Niobrara, Wyoming, with a primary purpose of fire protection, stock, or small fish pond.
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Summary
Built in 1975 by designer Richard Anesi, this dam stands at a height of 27 feet and has a storage capacity of 84 acre-feet. Situated along the Brenner Draw tributary of the South Fork Cheyenne River, this structure serves as a vital resource for the surrounding area in Edgemont, SD.
Despite its low hazard potential, Brenner's condition assessment is currently rated as poor, with the last inspection conducted in August 2017. With uncontrolled spillways and one outlet gate, the dam poses a moderate risk (rating of 3) to the surrounding area. While the dam has not been significantly modified in recent years, it is important to note that it is in need of maintenance and potential improvements to ensure its continued safety and effectiveness in providing fire protection and water storage for the community.
In light of its importance for fire protection and water resource management, Brenner presents an opportunity for stakeholders and regulatory agencies to collaboratively address its poor condition assessment and implement risk management measures. With a focus on maintaining the dam's functionality and safety, it is crucial for ongoing inspections, maintenance, and potential upgrades to be prioritized to mitigate any potential risks associated with this essential infrastructure.
Year Completed |
1975 |
Dam Length |
450 |
Dam Height |
27 |
River Or Stream |
BRENNER DRAW TR S FK CHEY RIV |
Primary Dam Type |
Earth |
Surface Area |
12 |
Hydraulic Height |
22 |
Nid Storage |
84 |
Structural Height |
27 |
Outlet Gates |
Uncontrolled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
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.
Brenner