Nefsy #2 (Custer) Reservoir Report
Nearby: Nefsy #1 Nefsy #4 (Custer)
Last Updated: December 6, 2025
Nefsy #2 (Custer) is a privately owned earth dam located in Miles City, Montana, specifically in Custer County.
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Summary
Completed in 1966, this dam serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a height of 21 feet and a length of 285 feet, Nefsy #2 has a storage capacity of 88 acre-feet and a normal storage level of 42 acre-feet. The dam is situated on TR-Foster Creek and is regulated by the Montana Department of Natural Resources and Conservation (DNRC).
Despite its low hazard potential, Nefsy #2 has not been rated for its condition assessment. The dam has not undergone recent inspections or maintenance, and no emergency action plan (EAP) has been prepared for it. While the risk management measures and flood inundation maps are not available for this structure, it remains crucial for water resource and climate enthusiasts to monitor its condition and advocate for the necessary safety protocols to be put in place. As a significant component of the local water infrastructure, Nefsy #2 plays a vital role in serving the community's needs for agricultural and fire protection purposes.
Year Completed |
1966 |
Dam Length |
285 |
Dam Height |
21 |
River Or Stream |
TR-FOSTER CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Nid Storage |
88 |
Hazard Potential |
Low |
Nid Height |
21 |
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.
Nefsy #2 (Custer)