Severson #3 Reservoir Report
Nearby: Severson #2 Jones #4
Last Updated: December 6, 2025
Severson #3 is a privately owned dam located in Miles City, Montana, along the TR-Johnson Creek.
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Summary
Completed in 1960, this earth dam stands at a height of 20 feet and has a storage capacity of 53 acre-feet, primarily serving the purposes of fire protection, stock, and small fish pond. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC), with inspections, enforcement, and permitting conducted by the state agency.
Despite being categorized as having a low hazard potential, Severson #3 has not been rated for its overall condition assessment. The dam's emergency action plan (EAP) status, risk assessment, and management measures are also currently unknown. While the dam is not owned or funded by any federal agency, it is situated within the jurisdiction of the Omaha District of the US Army Corps of Engineers, with Congressman Greg Gianforte representing the area in Congressional District 00 of Montana.
Water resource and climate enthusiasts interested in Severson #3 can find this dam as a significant point of interest in the Custer County area, offering insights into local water management practices, potential environmental impacts, and the importance of proper dam maintenance and regulation. The dam's location, purpose, and state-regulated status make it a valuable case study for understanding the interactions between human development, water resources, and the environment in the region.
Year Completed |
1960 |
Dam Length |
250 |
Dam Height |
20 |
River Or Stream |
TR-JOHNSON CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
53 |
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.
Severson #3