Helluva Reservoir Report
Nearby: Peters #2 Cooper Adams #1
Last Updated: December 5, 2025
Helluva is a private dam located in Mosby, Montana, along the TR-Boxelder Creek.
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Summary
Built in 1956, this earth dam stands at a height of 22 feet and has a storage capacity of 70 acre-feet. The primary purpose of Helluva is for fire protection, stock, or as a small fish pond, showcasing its importance in providing essential resources for the surrounding area.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Helluva is regulated and inspected by the state to ensure its safety and compliance with regulations. With a low hazard potential and a condition assessment of "Not Rated," Helluva continues to serve its purpose effectively while maintaining a level of safety for the community. As an enthusiast for water resources and climate, Helluva presents an intriguing case study of a privately owned dam contributing to the local ecosystem and providing valuable water resources for various uses.
Helluva's location in Fergus County, Montana, highlights its significance in the region's water management infrastructure. With a history of serving as a reliable source for fire protection and stock watering, Helluva plays a vital role in supporting the local community. As climate change continues to impact water resources, understanding the management and maintenance of dams like Helluva becomes increasingly important for ensuring sustainable water use and resilience in the face of changing environmental conditions.
Year Completed |
1956 |
Dam Length |
200 |
Dam Height |
22 |
River Or Stream |
TR-BOXELDER CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
22 |
Nid Storage |
70 |
Hazard Potential |
Low |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River Near Landusky Mt
|
9100cfs |
Judith River Nr Mouth
|
368cfs |
Musselshell River At Mosby Mt
|
12cfs |
Flatwillow Creek Near Mosby Mt
|
17cfs |
Peoples Creek Near Hays Mt
|
4cfs |
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.
Helluva