Mable #2 Reservoir Report
Nearby: Pea Ridge #1 Dam Vesvick
Last Updated: December 6, 2025
Mable #2 is a private earth dam located in Phillips County, Montana, along the TR-Coburn Coulee river.
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Summary
Completed in 1960, this dam serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a height of 12 feet and a storage capacity of 174 acre-feet, Mable #2 plays a crucial role in water resource management in the area. Despite its low hazard potential, the dam has not been rated for its condition and lacks regular inspections.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Mable #2 is subject to state regulations and inspections to ensure its safety and functionality. Located within Congressional District 00, Montana, the dam is overseen by Congressman Greg Gianforte (R) and falls under the jurisdiction of the state regulatory agency. While the dam has not been modified in recent years and lacks detailed risk assessment and emergency preparedness plans, it remains a vital infrastructure for water supply and agricultural activities in the region.
Enthusiasts of water resources and climate change will find Mable #2 to be an interesting case study of a privately owned dam with multiple purposes and a history dating back to the 1960s. With its location in a rural area and limited hazard potential, the dam presents opportunities for further research on its condition, risk management measures, and potential impacts of climate change on its operation. As water scarcity and extreme weather events become more prevalent, understanding the role of dams like Mable #2 in sustainable water management is crucial for ensuring the resilience of local communities and ecosystems.
Year Completed |
1960 |
Dam Length |
125 |
Dam Height |
12 |
River Or Stream |
TR-COBURN COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
12 |
Nid Storage |
174 |
Hazard Potential |
Low |
Nid Height |
12 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Alex Camp
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Devils Creek Campground
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Devils Creek- Lake Fort Peck
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Fourchette Creek- Lake Fort Peck
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Mable #2