Jones (Custer) Reservoir Report
Nearby: Love L Krutzfeldt #6
Last Updated: December 5, 2025
Jones (Custer) is a privately owned irrigation dam located in Custer, Montana, along the TR-ASH CREEK.
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Summary
Built in 1936, this earth dam stands at a height of 32 feet and has a storage capacity of 202 acre-feet. The dam serves the primary purpose of irrigation and is regulated by the Montana Department of Natural Resources and Conservation (DNRC), with state permitting, inspection, and enforcement in place.
Despite its age, Jones (Custer) has a low hazard potential and is currently rated as 'Not Rated' in terms of its condition assessment. It has not been modified in recent years and does not have an emergency action plan (EAP) in place. The dam is not owned or funded by any federal agencies, and is not operated by the US Army Corps of Engineers. It is situated within Congressional District 00 of Montana, represented by Greg Gianforte.
Overall, Jones (Custer) is a vital component of the local irrigation infrastructure in Custer County, Montana. With its historical significance and continued operational role, it remains a key structure in water resource management in the region, serving the agricultural community and contributing to the overall sustainability of water resources in the area.
Year Completed |
1936 |
Dam Length |
700 |
Dam Height |
32 |
River Or Stream |
TR-ASH CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
202 |
Hazard Potential |
Low |
Nid Height |
32 |
Seasonal Comparison
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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.
Jones (Custer)