Hyades Reservoir Report
Nearby: Berthelote Wood (Toole)
Last Updated: December 21, 2025
Hyades, located in GALATA, Toole County, Montana, is a privately owned earth dam completed in 1956 for irrigation purposes.
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Summary
It stands at a height of 12 feet and has a storage capacity of 158 acre-feet. The dam is situated on DIFFUSED SURFACE WATER and is regulated by the Montana Department of Natural Resources and Conservation (DNRC). Despite its low hazard potential, the dam's condition assessment is currently listed as "Not Rated."
Managed by private owners, Hyades is subject to state jurisdiction and regulatory oversight, including permitting, inspections, and enforcement. The dam's primary purpose is to facilitate irrigation in the region, with a normal storage capacity of 20 acre-feet. While details about the dam's condition assessment and emergency action plan are not available, the structure's risk management measures and compliance with guidelines are yet to be determined. With its strategic location and historical significance in the region, Hyades serves as a vital water resource for agricultural activities in Toole County, Montana.
Year Completed |
1956 |
Dam Length |
40 |
Dam Height |
12 |
River Or Stream |
DIFFUSED SURFACE WATER |
Primary Dam Type |
Earth |
Hydraulic Height |
12 |
Nid Storage |
158 |
Hazard Potential |
Low |
Nid Height |
12 |
Seasonal Comparison
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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.
Hyades