Obermayer Lake Reservoir Report

Last Updated: December 21, 2025

Obermayer Lake, located in Lincoln, Montana, is a privately owned water resource managed by the Montana Department of Natural Resources and Conservation (DNRC).


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Summary

This Earth dam, completed in 1950, serves multiple purposes including fire protection, stock watering, and as a small fish pond. With a dam height of 15 feet and a storage capacity of 69 acre-feet, Obermayer Lake plays a vital role in supporting the local ecosystem and providing water for various uses in the area.

Situated near Long Creek and surrounded by the picturesque landscape of Yaak, Obermayer Lake has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. While specific details such as spillway type, surface area, and drainage area are not provided, the lake continues to serve its intended purposes effectively. As a popular spot for water resource and climate enthusiasts, Obermayer Lake offers a serene setting for recreation and appreciation of the natural environment.

Despite its remote location, Obermayer Lake remains a valuable asset in the region, contributing to fire protection efforts and ensuring water availability for livestock and wildlife. With a long history dating back to the mid-20th century, this man-made reservoir continues to be a key feature in the local landscape, reflecting the importance of sustainable water management practices in the face of changing climate conditions. As enthusiasts explore the area, they can appreciate the beauty and functionality of Obermayer Lake while recognizing the need for continued stewardship to preserve its ecological integrity.

Year Completed

1950

Dam Length

300

Dam Height

15

River Or Stream

LONG CREEK

Primary Dam Type

Earth

Hydraulic Height

15

Nid Storage

69

Hazard Potential

Low

Nid Height

15
       
Seasonal Comparison

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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.