Stub Reservoir Report

Last Updated: December 19, 2025

Located in Daniels County, Montana, Stub is a privately owned earth dam completed in 1948 for fire protection, stock, or small fish pond purposes.


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Summary

With a height of 18 feet and a length of 300 feet, Stub sits on the South Fork Rock Creek and is under the regulatory oversight of the Montana Department of Natural Resources and Conservation (DNRC). The dam has a storage capacity of 225 acre-feet and is classified as having a low hazard potential.

Despite being categorized as "Not Rated" in terms of condition assessment, Stub is subject to regular state inspections, enforcement, and permitting to ensure its safety and functionality. It is important to note that the dam is not owned or funded by any federal agency and does not fall under the jurisdiction of the US Army Corps of Engineers. With its primary purpose being fire protection and water storage, Stub serves as a crucial infrastructure for the local community in Hinsdale and surrounding areas. Climate and water resource enthusiasts will find Stub's design and operational details fascinating, showcasing the intersection of human intervention and environmental sustainability in managing water resources.

Year Completed

1948

Dam Length

300

Dam Height

18

River Or Stream

SOUTH FORK ROCK CREEK

Primary Dam Type

Earth

Hydraulic Height

18

Nid Storage

225

Hazard Potential

Low

Nid Height

18
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.