Montana #7 Reservoir Report
Nearby: Borer #2 Big Timber #3
Last Updated: December 7, 2025
Montana #7 is a state-regulated earth dam located in Rosebud County, Montana, serving multiple purposes such as fire protection, stock watering, and small fish pond management.
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Summary
Constructed in 1953 by the USDA NRCS, this dam has a height of 15 feet and a storage capacity of 62 acre-feet, with a normal storage level of 32 acre-feet. Situated on the TR-Yellowstone River, this dam plays a crucial role in water resource management in the region, providing essential support for various agricultural and environmental needs.
With a low hazard potential and a moderate risk assessment rating, Montana #7 is deemed to be in satisfactory condition, although its condition assessment is currently not rated. It is noteworthy that the dam does not have an Emergency Action Plan (EAP) prepared or updated, raising concerns about emergency response readiness in case of a potential breach or failure. Despite these challenges, the dam continues to be inspected, regulated, and enforced by the Montana Department of Natural Resources and Conservation (DNRC), ensuring its safety and compliance with state regulations.
As an integral part of the water infrastructure in the area, Montana #7 stands as a testament to the importance of proper dam management and maintenance. With its strategic location on the TR-Yellowstone River and its vital role in supporting local agriculture and environmental conservation efforts, this dam serves as a valuable resource for the community. As water resource and climate enthusiasts, it is crucial to recognize the significance of structures like Montana #7 in safeguarding water supplies and mitigating risks associated with potential hazards.
Year Completed |
1953 |
Dam Length |
150 |
Dam Height |
15 |
River Or Stream |
TR-YELLOWSTONE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Drainage Area |
0.78 |
Nid Storage |
62 |
Hazard Potential |
Low |
Nid Height |
15 |
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.
Montana #7