J Galt #10 Reservoir Report
Nearby: B G Olson #2 B G Olson #1
Last Updated: December 8, 2025
J Galt #10 is a privately owned dam located in Rosebud, Montana, specifically in the city of Forsyth.
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Summary
Completed in 1950, this Earth-type dam serves the primary purpose of irrigation along the TR-Nelson Coulee river or stream. With a height of 8 feet and a length of 1500 feet, J Galt #10 has a storage capacity of 1200 acre-feet, providing water resources for the surrounding area.
Maintained by the Montana Department of Natural Resources and Conservation (DNRC), J Galt #10 is classified as a low hazard potential structure with a condition assessment of "Not Rated". Although the dam has not been inspected recently, it is regulated, permitted, and inspected by the state authorities. The dam's Emergency Action Plan (EAP) status and risk assessment are currently unknown, indicating a need for further evaluation and updates to ensure the safety and efficiency of this vital water resource infrastructure.
For water resource and climate enthusiasts, J Galt #10 presents an intriguing case study of a historic dam in Montana that plays a crucial role in providing irrigation water in the region. With its location along the TR-Nelson Coulee and its low hazard potential, this dam serves as a reminder of the importance of proper maintenance, inspection, and emergency preparedness to ensure the continued functionality and safety of our water infrastructure in the face of changing climate conditions.
Year Completed |
1950 |
Dam Length |
1500 |
Dam Height |
8 |
River Or Stream |
TR-NELSON COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
8 |
Nid Storage |
1200 |
Hazard Potential |
Low |
Nid Height |
8 |
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.
J Galt #10