Robbie (Teton) Reservoir Report
Last Updated: December 5, 2025
Robbie (Teton) is a privately owned dam located in Dutton, Montana, with a primary purpose classified as "Other." Constructed in 1940, this earth dam stands at a height of 8 feet and a length of 150 feet, providing a storage capacity of 63 acre-feet.
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Summary
The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is subject to state jurisdiction, permitting, inspection, and enforcement.
Situated on diffused surface water in Teton County, Robbie (Teton) has a low hazard potential and a condition assessment that is currently not rated. Despite its age, the dam has not undergone any modifications over the years and does not have an Emergency Action Plan (EAP) in place. With a maximum storage capacity of 63 acre-feet and a normal storage of 8 acre-feet, Robbie (Teton) serves as a critical water resource in the region, contributing to water supply and management efforts in the area.
For water resource and climate enthusiasts, Robbie (Teton) presents an intriguing case study of a historic dam in Montana that continues to play a vital role in water storage and management. As efforts to assess and monitor the condition of dams like Robbie (Teton) grow in importance, understanding the regulatory framework and operational aspects of such structures becomes essential for ensuring their safety and functionality in the face of evolving climate patterns and water resource challenges.
Year Completed |
1940 |
Dam Length |
150 |
Dam Height |
8 |
River Or Stream |
DIFFUSED SURFACE WATER |
Primary Dam Type |
Earth |
Hydraulic Height |
8 |
Nid Storage |
63 |
Hazard Potential |
Low |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Lake Creek Near Power Mt
|
30cfs |
Teton River Near Dutton Mt
|
83cfs |
Muddy Creek At Vaughn Mt
|
86cfs |
Sun River Near Vaughn Mt
|
2680cfs |
Sun River At Simms Mt
|
1620cfs |
Missouri River Near Ulm Mt
|
3160cfs |
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.
Robbie (Teton)