Glasscock Reservoir #1 Reservoir Report
Nearby: Glasscock Reservoir #2 Floodly
Last Updated: December 6, 2025
Glasscock Reservoir #1, located in Garfield, Montana, is a privately owned earth dam completed in 1947 primarily for irrigation purposes.
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Summary
With a dam height of 20 feet and a storage capacity of 124 acre-feet, the reservoir lies along the TR-FROZEN DOG COULEE stream and is regulated by the Montana Department of Natural Resources and Conservation (DNRC). Despite being non-federally owned, the reservoir is subject to state jurisdiction, permitting, inspection, and enforcement.
This low-hazard reservoir has not been rated for its condition assessment, and there is no record of recent inspections or emergency preparedness measures. The structure spans 930 feet in length and has a normal storage capacity of 63 acre-feet, serving as a vital resource for irrigation in the region. While the reservoir does not have spillway or lock structures, its location and purpose make it a key component of the local water resource management system.
Represented by Congressman Greg Gianforte in Congressional District 00, Montana, Glasscock Reservoir #1 plays a significant role in sustaining agricultural activities in the area. As a state-regulated facility, it highlights the importance of private ownership in water resource management and the need for ongoing monitoring and maintenance to ensure its continued functionality and safety for the community.
Year Completed |
1947 |
Dam Length |
930 |
Dam Height |
20 |
River Or Stream |
TR-FROZEN DOG COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
124 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Glasscock Reservoir #1