Mccoys Reservoir Report
Nearby: Primrose Whitetail (Daniels)
Last Updated: January 11, 2026
Mccoys is a privately owned earth dam located in Daniels, Montana, designed by USDA NRCS for fire protection, stock, or small fish pond purposes.
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Summary
Completed in 1966, this dam stands at a height of 30 feet and has a storage capacity of 111 acre-feet. Situated on TR-Middle Fork Eagle Creek, Mccoys serves as a vital water resource for the surrounding area with a drainage area of 2.39 square miles and a maximum discharge of 300 cubic feet per second.
Managed by DNRC, Mccoys has a low hazard potential and is currently rated as 'Not Rated' in terms of its condition assessment. The dam has a spillway width of 50 feet and is located in Congressional District 00, Montana, represented by Greg Gianforte (R). Although the dam is not regulated by federal agencies, it is subject to state permitting, inspection, and enforcement, ensuring its continued safe operation for fire protection and agricultural needs in the region.
For water resource and climate enthusiasts, Mccoys represents a significant infrastructure for maintaining water supply and mitigating potential risks in Daniels County. With its strategic location and purpose-driven design, this dam serves as a reliable resource for fire protection and supporting local agriculture. As climate change continues to impact water resources, the importance of structures like Mccoys in managing water supply and ensuring community resilience becomes increasingly apparent.
Year Completed |
1966 |
Dam Length |
200 |
Dam Height |
30 |
River Or Stream |
TR-MIDDLE FORK EAGLE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Drainage Area |
2.39 |
Nid Storage |
111 |
Hazard Potential |
Low |
Nid Height |
30 |
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.
Mccoys