Mccloy Reservoir Report
Last Updated: December 24, 2025
Mccloy, R.
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Summary
is a privately owned irrigation dam located in Circle, Montana, along Dry Creek. Constructed in 1943 by the USDA NRCS, this Earth dam stands at 20 feet tall and has a length of 300 feet, providing a storage capacity of 176 acre-feet. The dam is regulated by the DNRC and undergoes regular inspections, with a low hazard potential rating.
The primary purpose of Mccloy, R. is irrigation, serving the agricultural needs of the surrounding area. The dam has a maximum discharge rate of 1000 cubic feet per second and features a spillway width of 100 feet. Despite its age, the condition of Mccloy, R. has not been rated and it has not undergone a recent inspection.
Located in McCone County, Montana, Mccloy, R. plays a vital role in water resource management in the region. With its historical significance and importance in supporting local agriculture, this dam stands as a testament to the engineering efforts of the past and the ongoing need for sustainable water infrastructure in the face of changing climate conditions.
Year Completed |
1943 |
Dam Length |
300 |
Dam Height |
20 |
River Or Stream |
DRY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
176 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Redwater River At Circle Mt
|
1cfs |
Nelson Creek Near Van Norman Mt
|
33cfs |
Yellowstone River At Glendive Mt
|
6000cfs |
Missouri River Near Wolf Point Mt
|
5020cfs |
Powder River Near Locate Mt
|
231cfs |
Yellowstone River At Miles City Mt
|
8100cfs |
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.
Mccloy, R.