Suphellen Reservoir Report
Nearby: Tomsheck The Pewter
Last Updated: December 21, 2025
Suphellen is a privately owned water resource located in GALATA, Toole County, Montana.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1950, this earthen dam stands at 17 feet high and stretches 570 feet in length, providing water storage for fire protection, livestock, and small fish pond purposes. Situated on the TR-BLACK COULEE river, Suphellen is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and falls within the jurisdiction of the state.
With a storage capacity of 220 acre-feet, Suphellen has a low hazard potential and has not been rated for its overall condition assessment. The dam has not undergone recent inspection or maintenance, indicating a need for further evaluation to ensure its safety and functionality. Despite being privately owned, Suphellen plays a crucial role in providing water resources for local agricultural and emergency purposes in the region.
As a significant water resource in the area, Suphellen serves as a vital asset for fire protection and livestock management. However, its lack of recent inspection and maintenance raises concerns about its long-term viability and safety. Climate enthusiasts and water resource conservationists may find Suphellen's history and status intriguing, prompting further research and advocacy for the sustainable management of this essential water source in Toole County, Montana.
Year Completed |
1950 |
Dam Length |
570 |
Dam Height |
17 |
River Or Stream |
TR-BLACK COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Nid Storage |
220 |
Hazard Potential |
Low |
Nid Height |
17 |
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.
Suphellen