Ronning #1 Reservoir Report
Nearby: Forest Creek (Custer) Bumgardner
Last Updated: December 6, 2025
Ronning #1 is a state-regulated dam located in Miles City, Montana, along the Miles Creek.
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Summary
Built in 1958, this Earth-type dam serves multiple purposes including fire protection, stock, and small fish pond. With a height of 20 feet and a length of 400 feet, the dam has a storage capacity of 101 acre-feet and a normal storage level of 53 acre-feet. Despite being classified as having a low hazard potential, the condition of Ronning #1 has not been formally assessed.
Owned by the state of Montana and regulated by the Department of Natural Resources and Conservation (DNRC), Ronning #1 plays a crucial role in water resource management in the region. It is strategically located in Custer County and serves as a vital asset for the local community. Although the dam has not undergone recent inspections or assessments, it remains operational for its intended purposes, providing essential services for fire protection and livestock management.
As an important structure in the area, Ronning #1 contributes to the overall water resource infrastructure and climate resilience efforts. Its presence ensures reliable water supply for various uses while also mitigating potential risks associated with flooding or water scarcity. With proper maintenance and oversight, Ronning #1 continues to play a key role in enhancing the sustainability and safety of the surrounding environment.
Year Completed |
1958 |
Dam Length |
400 |
Dam Height |
20 |
River Or Stream |
MILES CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
101 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Ronning #1