Armells Reservoir Reservoir Report
Last Updated: December 5, 2025
Armells Reservoir, located in Fergus County, Montana, is a private-owned water resource primarily used for irrigation purposes.
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Summary
The reservoir, completed in 1951, has a dam height of 38 feet and a storage capacity of 1,340 acre-feet. With a surface area of 40.2 acres, the reservoir is fed by Armells Creek and plays a crucial role in supporting agricultural activities in the region.
Managed by the Montana Department of Natural Resources and Conservation, Armells Reservoir has been deemed to have low hazard potential and is currently in a condition that has not been rated. Despite its relatively modest size, the reservoir serves as a vital water source for the surrounding area, providing essential irrigation water for crops. As a key component of the local water infrastructure, the reservoir's maintenance and regulation are closely monitored to ensure its continued functionality and safety.
Located within Congressional District 00, Montana, Armells Reservoir is a testament to the importance of water management in sustaining agriculture and livelihoods in the region. With its strategic location and reliable water supply, the reservoir contributes significantly to the local economy and ecosystem, highlighting the interconnected nature of water resources and climate resilience in the face of changing environmental conditions.
Year Completed |
1951 |
Dam Length |
905 |
Dam Height |
38 |
River Or Stream |
ARMELLS CREEK |
Primary Dam Type |
Earth |
Surface Area |
40.2 |
Hydraulic Height |
22 |
Nid Storage |
1340 |
Hazard Potential |
Low |
Nid Height |
38 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River Near Landusky Mt
|
9100cfs |
Judith River Nr Mouth
|
368cfs |
Peoples Creek Near Hays Mt
|
4cfs |
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.
Armells Reservoir