No. Decker Flood Control Reservoir No. 2 Reservoir Report
Nearby: Sediment Control Dam Pond R1
Last Updated: December 5, 2025
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Summary
Decker Flood Control Reservoir No. 2, located in Big Horn, Montana, is a private-owned dam regulated by the state's Department of Natural Resources and Conservation (DNRC). This reservoir, with a primary purpose of water supply, has a dam height of 52 feet and a storage capacity of 287.93 acre-feet. The dam's hazard potential is considered significant, with a fair condition assessment as of May 2012.
The reservoir, completed at an undisclosed date, falls under the jurisdiction of the Omaha District of the US Army Corps of Engineers. It is primarily used for water supply purposes and has a maximum discharge capacity of 1243 cubic feet per second. Despite its moderate risk assessment rating, the dam has not undergone any modifications or significant risk management measures, according to the available data.
No. Decker Flood Control Reservoir No. 2 serves as a crucial water resource in the region, with its regulated operations ensuring the safety of surrounding communities. Its significant storage capacity and controlled spillway system contribute to flood control efforts, making it a vital asset for water management and climate resilience in the area.
Dam Height |
52 |
Primary Dam Type |
Earth |
Drainage Area |
13.46 |
Nid Storage |
287.93 |
Hazard Potential |
Significant |
Nid Height |
52 |
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.
No. Decker Flood Control Reservoir No. 2