Chezum #1 Reservoir Report
Nearby: Bumgardner Ronning #1
Last Updated: December 6, 2025
Chezum #1 is a privately owned earth dam located in Garland, Montana, on the TR-North Fork Six Mile Creek.
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Summary
Completed in 1960, this dam serves multiple purposes, including fire protection, stock watering, and small fish pond management. With a height of 20 feet and a storage capacity of 86 acre-feet, Chezum #1 has a low hazard potential and is currently in a not rated condition assessment status.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Chezum #1 is regulated, permitted, inspected, and enforced by the state agency. The dam is situated in Congressional District 00, represented by Greg Gianforte, and falls under the jurisdiction of the Omaha District of the US Army Corps of Engineers. Despite lacking specific data on surface area, drainage area, or spillway type, Chezum #1 remains a critical resource for water management and conservation in the Custer County region.
Although Chezum #1 has yet to undergo a condition assessment and lacks detailed information on emergency action plans, risk assessments, and inundation mapping, its significance in providing essential water resources for fire protection, livestock, and fisheries highlights the importance of ongoing monitoring and maintenance to ensure its continued functionality and safety in the face of changing climate conditions.
Year Completed |
1960 |
Dam Length |
175 |
Dam Height |
20 |
River Or Stream |
TR-NORTH FORK SIX MILE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
86 |
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.
Chezum #1