Sunday Creek Reservoir Reservoir Report

Last Updated: December 6, 2025

Sunday Creek Reservoir, located in Rosebud County, Montana, is a private water resource managed by the Department of Natural Resources and Conservation (DNRC).


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Summary

Built in 1953, this earth dam stands at a height of 18 feet and serves multiple purposes including fire protection, stock watering, and small fish pond creation. With a storage capacity of 123 acre-feet and a normal storage capacity of 81 acre-feet, the reservoir plays a crucial role in meeting the water needs of the surrounding area.

Situated on South Sunday Creek, Sunday Creek Reservoir poses a low hazard potential and has not been formally rated in terms of condition assessment. Despite its age, the dam has not undergone any significant modifications and its inspection frequency, emergency action plan preparation, and risk assessment are currently not documented. With its strategic location and functional design, the reservoir continues to support the local community's water needs while also serving as a vital resource for wildlife and fire protection efforts in the region.

As water resource and climate enthusiasts explore the unique features of Sunday Creek Reservoir, its historical significance and ongoing role in providing essential water services become apparent. With its modest size and low hazard potential, this private reservoir highlights the importance of effective water management practices and the need for continued monitoring and maintenance to ensure its long-term sustainability. As climate change impacts water resources, Sunday Creek Reservoir serves as a reminder of the critical role that such infrastructure plays in supporting both human and environmental well-being in the face of evolving climatic challenges.

Year Completed

1953

Dam Length

477

Dam Height

18

River Or Stream

SOUTH SUNDAY CREEK

Primary Dam Type

Earth

Hydraulic Height

18

Nid Storage

123

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.