Decuman Reservoir Report
Nearby: Harvey Lake Farmers Coop Canal Co
Last Updated: January 11, 2026
Decuman is a privately owned earth dam located in Teton, Montana, with a primary purpose of providing fire protection, stock watering, and serving as a small fish pond.
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Summary
Completed in 1965, the dam stands at a height of 15 feet and has a storage capacity of 62 acre-feet. Situated on the TR-Farmers Canal, Decuman plays a crucial role in water resource management in the area, particularly for agricultural and wildlife purposes.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Decuman is regulated, inspected, and enforced by the state to ensure its safe operation. With a low hazard potential and a current condition assessment of "Not Rated," the dam serves as a vital infrastructure for the local community while posing minimal risk. Despite lacking certain detailed assessments and emergency preparedness measures, Decuman remains a key asset in the region's water resource and climate resilience efforts.
As a part of the broader water infrastructure network in the area, Decuman contributes to the overall water management system by providing essential services and benefits to the environment and the community. With its strategic location and functions, the dam underscores the importance of sustainable water resource management in addressing the challenges posed by climate change and ensuring the availability of water for various needs in the region.
Year Completed |
1965 |
Dam Length |
600 |
Dam Height |
15 |
River Or Stream |
TR-FARMERS CANAL |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
62 |
Hazard Potential |
Low |
Nid Height |
15 |
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.
Decuman