Robbie Reservoir Report
Nearby: Weppler #2 Weppler #1
Last Updated: January 10, 2026
Robbie, located in Sweet Grass, Montana, is a privately owned earth dam designed by USDA NRCS for irrigation purposes on TR-MIDDLE CREEK.
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Summary
It stands at a height of 25 feet and has a length of 700 feet, with a storage capacity of 98 acre-feet completed in 1977. The dam is regulated by the DNRC and is subject to state jurisdiction and permitting, inspection, and enforcement.
With a significant hazard potential, Robbie has not been rated for its condition assessment. Despite this, it continues to serve its primary purpose of irrigation for the surrounding area. The dam is located in Congressional District 00, Montana, under the representation of Greg Gianforte (R). The dam has not been modified in recent years and lacks emergency preparedness measures such as an Emergency Action Plan (EAP).
Water resource and climate enthusiasts are drawn to Robbie's role in providing vital irrigation water to the area. Its historical significance as a key infrastructure for agriculture in Montana adds to its appeal among those interested in sustainable water management practices. As concerns about climate change grow, understanding the condition and management of dams like Robbie becomes essential for ensuring the resilience of water resources in the face of evolving environmental challenges.
Year Completed |
1977 |
Dam Length |
700 |
Dam Height |
25 |
River Or Stream |
TR-MIDDLE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
98 |
Hazard Potential |
Significant |
Nid Height |
25 |
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.
Robbie