Mcmullin Bros Detention Reservoir Report
Last Updated: December 6, 2025
Mcmullin Bros Detention is a private water resource structure located in Prairie County, Montana, designed by the USDA NRCS and regulated by the DNRC.
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Summary
Completed in 1966, this earth dam stands at 30 feet high and has a storage capacity of 50 acre-feet, primarily serving purposes such as fire protection, stock watering, and small fish pond management. Situated on Timber Creek, this detention structure covers a drainage area of 3.75 square miles and has a low hazard potential.
With a spillway width of 200 feet and a maximum discharge capacity of 320 cubic feet per second, Mcmullin Bros Detention serves as a vital asset for water management in the region. Despite its age, the dam's condition is currently rated as "Not Rated," indicating a need for further assessment and potential maintenance. As a key feature for fire protection and agricultural needs, this structure plays a crucial role in water resource management in the area, highlighting the importance of ongoing inspection and regulatory oversight to ensure its continued functionality and safety for the community.
Year Completed |
1966 |
Dam Length |
300 |
Dam Height |
30 |
River Or Stream |
TIMBER CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Drainage Area |
3.75 |
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 Detention