Howard Coulee #1 Reservoir Report
Nearby: Goffena #4 Gofara #8
Last Updated: December 5, 2025
Howard Coulee #1 is a privately owned earth dam located in Mosby, Montana, designed by the USDA NRCS and completed in 1939.
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Summary
The dam serves multiple purposes including fire protection, stock watering, and small fish pond management. With a dam height of 25 feet and a storage capacity of 70 acre-feet, it provides essential water resources for the surrounding area.
This dam on TR-Howard Coulee has a low hazard potential and is not currently rated for its condition. However, it is regulated, permitted, inspected, and enforced by the Montana Department of Natural Resources Conservation (DNRC). The dam's spillway is uncontrolled with a width of 25 feet, and it has a moderate risk assessment rating.
Water resource and climate enthusiasts will appreciate the historical significance and functionality of Howard Coulee #1, which continues to play a crucial role in water management in Petroleum County, Montana. With its strategic location and multi-purpose design, this dam exemplifies the importance of sustainable water infrastructure in mitigating risks and supporting various ecological and agricultural activities in the region.
Year Completed |
1939 |
Dam Length |
100 |
Dam Height |
25 |
River Or Stream |
TR-HOWARD COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Drainage Area |
2.66 |
Nid Storage |
70 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
Howard Coulee #1