Robinson #3 Reservoir Report
Nearby: Robinson #7 Robinson #2
Last Updated: December 6, 2025
Robinson #3 is a privately owned earth dam located in Mizpah, Montana, on the Miles City Creek.
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Summary
Built in 1956 for irrigation purposes, this dam stands at 28 feet tall with a hydraulic height of 21 feet. With a storage capacity of 390 acre-feet, it plays a crucial role in water management for the surrounding area. Despite its age, the dam is classified as having a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Robinson #3 is subject to state regulations, permitting, inspection, and enforcement. The dam has not been modified in recent years and lacks certain features such as spillways and outlet gates. While it meets the necessary guidelines for emergency action planning, there are no inundation maps prepared for potential risk assessment. With the dam situated in a rural area, the emergency contact information and overall risk management measures are unclear.
Overall, Robinson #3 serves as a critical asset for irrigation in Custer County, Montana, and the surrounding areas. As a privately owned structure with limited federal involvement, its condition and safety are crucial for water resource and climate enthusiasts to monitor. With the potential for low hazard and the absence of certain safety features, continued oversight and maintenance of this dam are essential to ensure the safety and sustainability of the water supply it provides.
Year Completed |
1956 |
Dam Length |
675 |
Dam Height |
28 |
River Or Stream |
MILES CITY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Nid Storage |
390 |
Hazard Potential |
Low |
Nid Height |
28 |
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.
Robinson #3