Mcmullin Bros Cooperative Reservoir Report
Last Updated: December 6, 2025
Located in Prairie, Montana, the Mcmullin Bros Cooperative is a privately owned water resource managed by the USDA NRCS.
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Summary
This cooperative serves multiple purposes, including fire protection, stock maintenance, and as a small fish pond. Completed in 1964, the earth dam stands at 30 feet high and spans 300 feet in length, with a storage capacity of 50 acre-feet.
The dam, situated on Timber Creek, is regulated by the Montana Department of Natural Resources Conservation (DNRC) and has a low hazard potential. With a moderate risk assessment rating, the Mcmullin Bros Cooperative has not been formally rated for its condition. Although there is no designated emergency action plan (EAP) in place, the dam is inspected, permitted, and enforced by the state regulatory agency. Overall, this cooperative serves as a vital resource for both water conservation and wildlife management in the region.
In terms of climate resilience, the Mcmullin Bros Cooperative plays a crucial role in mitigating potential water-related hazards and providing a sustainable water source for the local ecosystem. As part of the Omaha District, this cooperative contributes to the overall water management efforts in Montana. With its strategic location and purposeful design, the Mcmullin Bros Cooperative showcases the importance of private-public partnerships in ensuring water security and environmental protection in the face of changing climate patterns.
Year Completed |
1964 |
Dam Length |
300 |
Dam Height |
30 |
River Or Stream |
TIMBER CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Drainage Area |
6.08 |
Nid Storage |
50 |
Hazard Potential |
Low |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Redwater River At Circle Mt
|
1cfs |
Nelson Creek Near Van Norman Mt
|
33cfs |
Yellowstone River At Miles City Mt
|
8100cfs |
Tongue River At Miles City Mt
|
263cfs |
Powder River Near Locate Mt
|
231cfs |
Yellowstone River At Glendive Mt
|
6000cfs |
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.
Mcmullin Bros Cooperative