Rock Creek Lake Dam Reservoir Report
Nearby: Taylor, Upper Doney Lake Dam
Last Updated: December 5, 2025
Rock Creek Lake Dam, located in Garrison, Montana, is a privately owned structure used primarily for irrigation purposes.
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Summary
Completed in 1900, this earth dam stands at a height of 25 feet and stretches 200 feet in length, with a storage capacity of 32 acre-feet. Situated on TR-Rock Creek, the dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC), with state jurisdiction and permitting in place. Despite being rated as having a low hazard potential, the dam's condition is currently listed as "Not Rated", suggesting a need for further assessment.
Owned and operated by a private entity, Rock Creek Lake Dam plays a crucial role in water resource management in Powell County, Montana. Its strategic location and purposeful design cater to the agricultural needs of the region, ensuring a reliable supply of water for irrigation. Although the dam has not been inspected in recent years and lacks a formal emergency action plan, its low hazard potential indicates a relatively low risk of failure. However, with the changing climate patterns and increasing demands on water resources, regular monitoring and maintenance of the dam are essential to sustain its functionality and safety.
As a significant feature in the water infrastructure of the area, Rock Creek Lake Dam serves as a testament to early engineering efforts in harnessing water for agricultural purposes. With its historical significance and ongoing role in supporting local irrigation needs, the dam stands as a reminder of the enduring importance of water resource management in the face of evolving climatic challenges. As enthusiasts of water resources and climate, understanding the dynamics of such structures is crucial in promoting sustainable practices and ensuring the resilience of our water systems for generations to come.
Year Completed |
1900 |
Dam Length |
200 |
Dam Height |
25 |
River Or Stream |
TR-ROCK CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
32 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Blackfoot River Near Garrison Mt
|
49cfs |
Clark Fork At Deer Lodge Mt
|
156cfs |
Clark Fork At Goldcreek Mt
|
248cfs |
Lost Creek Near Galen
|
36cfs |
Flint Creek Near Drummond Mt
|
109cfs |
Boulder Creek At Maxville Mt
|
22cfs |
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.
Rock Creek Lake Dam