Standley Irrigation Dam Reservoir Report

Last Updated: December 5, 2025

Standley Irrigation Dam, located in Teton County, Montana, is a vital water resource structure primarily used for irrigation purposes.


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Summary

This privately-owned dam, completed in 1977, stands at a height of 15 feet and has a storage capacity of 50 acre-feet, with a normal storage level of 30 acre-feet. Situated on the Teton River, the dam plays a crucial role in providing water for agricultural activities in the surrounding area.

Managed by the Montana Department of Natural Resources and Conservation (DNRC), Standley Irrigation Dam is state-regulated, inspected, and enforced to ensure its safe operation and compliance with regulatory standards. With a low hazard potential, the dam has not been rated for its condition assessment, but it continues to serve its intended purpose effectively. Despite not having a designated emergency action plan or updated risk assessment measures, the dam remains a key infrastructure for water management in the region.

While Standley Irrigation Dam may not have a high-profile status, its importance in supporting agricultural irrigation in the area cannot be understated. As climate change continues to impact water resources, structures like this play a crucial role in ensuring sustainable water management practices for the future. Enthusiasts of water resources and climate resilience will find Standley Irrigation Dam to be a fascinating example of how local infrastructure contributes to the larger goal of water security and environmental stewardship.

Year Completed

1977

Dam Length

100

Dam Height

15

River Or Stream

TR-TETON RIVER

Primary Dam Type

Earth

Hydraulic Height

15

Nid Storage

50

Hazard Potential

Low

Nid Height

15
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.