Berthelote Reservoir Report
Nearby: Hyades Big Lake (Toole)
Last Updated: December 21, 2025
Berthelote is a privately owned dam located in GALATA, Montana, along the GREEN COULEE river.
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Summary
Built in 1955 by the USDA NRCS, this Earth type dam stands at a height of 25 feet and has a length of 303 feet, providing irrigation water for the surrounding area. With a storage capacity of 70 acre-feet, the dam has a low hazard potential and is classified as having a moderate risk level.
The dam is regulated by the Montana Department of Natural Resources Conservation (DNRC) and undergoes regular inspection, permitting, and enforcement to ensure its structural integrity and safety. Despite not being rated for its condition, the dam meets the necessary guidelines and is equipped with an uncontrolled spillway with a width of 50 feet to manage potential flooding events. The risk management measures for Berthelote are currently not specified, but its risk assessment suggests a moderate level of risk, indicating the importance of proper maintenance and monitoring.
Overall, Berthelote serves a crucial role in providing irrigation water for the region while managing its flood risk effectively. As a privately owned structure, it is subject to state regulations and oversight to ensure its continued functionality and safety for the local community. With its history of serving the area since the 1950s, Berthelote remains a vital infrastructure for water resource management in Toole, Montana.
Year Completed |
1955 |
Dam Length |
303 |
Dam Height |
25 |
River Or Stream |
GREEN COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Drainage Area |
3.13 |
Nid Storage |
70 |
Hazard Potential |
Low |
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.
Berthelote