Tomsheck Reservoir Report
Nearby: Kimmett - Kleinert Berthelote
Last Updated: December 21, 2025
Tomsheck is a privately owned irrigation dam located in Toole County, Montana, along the Two Mile Coulee.
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Summary
Built in 1954 by the USDA NRCS, this Earth-type dam stands at a height of 36 feet and stretches 540 feet in length, with a storage capacity of 384 acre-feet. The dam serves the primary purpose of irrigation, supporting agricultural activities in the region.
Despite being regulated by the Montana DNRC and meeting state permitting and inspection requirements, Tomsheck is classified as having a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The dam has a spillway width of 21 feet and a maximum discharge capacity of 95 cubic feet per second. While the emergency action plan status and risk assessment details for the dam are currently unknown, Tomsheck remains a crucial water resource infrastructure in the area.
Overall, Tomsheck plays a vital role in water management and agricultural irrigation in Toole County, Montana. With its modest size and capacity, the dam provides essential water storage for the region while maintaining a low hazard potential. As a key piece of infrastructure designed by the USDA NRCS, Tomsheck exemplifies the importance of sustainable water resource management in the face of climate challenges.
Year Completed |
1954 |
Dam Length |
540 |
Dam Height |
36 |
River Or Stream |
TWO MILE COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
36 |
Drainage Area |
4.69 |
Nid Storage |
384 |
Hazard Potential |
Low |
Nid Height |
36 |
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.
Tomsheck