Cap Rock #1 Reservoir Report
Nearby: Hamlick Reservoir Cap Rock #4
Last Updated: December 6, 2025
Cap Rock #1 is a privately owned earth dam located in Kinsey, Montana, along the TR-Muster Creek.
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Summary
Built in 1966, this dam serves multiple purposes including fire protection, stock, and small fish pond. With a height of 20 feet and a storage capacity of 62 acre-feet, Cap Rock #1 plays a crucial role in the local water resource management system.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Cap Rock #1 is regulated, inspected, and enforced to ensure its safety and functionality. Despite being classified as low hazard potential and not yet rated for condition assessment, the dam remains an essential infrastructure for the surrounding area. Situated in a picturesque location in Custer County, Montana, this dam contributes to the overall water supply and management efforts in the region.
Cap Rock #1, with its strategic location and purposeful design, represents a vital component of the water resource infrastructure in Montana. While it may not have undergone recent inspections or condition assessments, its importance in fire protection, livestock watering, and small-scale fisheries cannot be understated. As climate change continues to affect water resources, Cap Rock #1 stands as a testament to the ongoing need for sustainable and well-maintained dams in the face of evolving environmental challenges.
Year Completed |
1966 |
Dam Length |
396 |
Dam Height |
20 |
River Or Stream |
TR-MUSTER CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
62 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yellowstone River At Miles City Mt
|
8100cfs |
Tongue River At Miles City Mt
|
263cfs |
Powder River Near Locate Mt
|
231cfs |
Pumpkin Creek Near Miles City Mt
|
0cfs |
Yellowstone River At Forsyth Mt
|
5430cfs |
Redwater River At Circle Mt
|
1cfs |
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.
Cap Rock #1