Coal Creek Dam #1 Reservoir Report
Nearby: Beardsley Retention Dam Beardsley #7
Last Updated: December 6, 2025
Coal Creek Dam #1, located in Terry, Montana, was completed in 1949 and serves multiple purposes including fire protection, stock, and small fish pond.
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Summary
This earth dam stands at a height of 19 feet and has a storage capacity of 50 acre-feet, with a normal storage level of 25 acre-feet. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected, permitted, and enforced by the state agency.
Situated on TR-Coal Creek in Custer County, Montana, Coal Creek Dam #1 has a low hazard potential and is currently rated as 'Not Rated' in terms of condition assessment. The dam is owned by the state and falls under state jurisdiction, with regular inspections and enforcement measures in place. Despite lacking certain detailed information such as spillway type and width, the dam's primary purpose of providing essential water resources for fire protection and livestock highlights its significance in the local ecosystem. For water resource and climate enthusiasts, Coal Creek Dam #1 offers a unique case study in sustainable water management and regulatory oversight in Montana.
Year Completed |
1949 |
Dam Length |
100 |
Dam Height |
19 |
River Or Stream |
TR-COAL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
19 |
Nid Storage |
50 |
Hazard Potential |
Low |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Coal Creek Dam #1