Mckinnsey Reservoir Reservoir Report

Nearby: Hybner Libra

Last Updated: December 20, 2025

Mckinnsey Reservoir, located in Hill, Montana, is a privately owned earth dam completed in 1914 for irrigation purposes.


°F

°F

mph

Wind

%

Humidity

Summary

The reservoir has a storage capacity of 960 acre-feet and covers a surface area of 131 acres. Situated on the TR-SAGE CREEK, the reservoir serves as a water source for agricultural activities in the region, highlighting its importance in sustaining local livelihoods.

With a dam height of 16 feet and a hydraulic height of 12 feet, Mckinnsey Reservoir is classified as having a low hazard potential. While the condition of the dam is currently not rated, it is under state regulation and inspection by the Department of Natural Resources and Conservation (DNRC) in Montana. Despite not having an Emergency Action Plan (EAP) in place, the reservoir meets state permitting and enforcement requirements, ensuring the safety and integrity of the dam structure.

As an essential component of the local water resource infrastructure, Mckinnsey Reservoir plays a crucial role in providing reliable water supply for irrigation activities in the area. Climate and water resource enthusiasts can appreciate the historical significance and functional importance of this reservoir in supporting sustainable agriculture and water management practices in the region.

Year Completed

1914

Dam Length

750

Dam Height

16

River Or Stream

TR-SAGE CREEK

Primary Dam Type

Earth

Surface Area

131

Hydraulic Height

12

Nid Storage

960

Hazard Potential

Low

Nid Height

16
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.