A C Lincoln Reservoir Report
Nearby: Cool Black Rock Delmar
Last Updated: December 20, 2025
A C Lincoln is a private dam located in Loma, Montana, that serves multiple purposes including fire protection, stock, and small fish pond.
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Summary
Built in 1930, this earth dam stands at a height of 31 feet and has a storage capacity of 129 acre-feet. Situated on the TR-Black Coulee river, A C Lincoln is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected regularly to ensure its safety and compliance with state regulations.
With a low hazard potential and a condition assessment that is currently not rated, A C Lincoln provides essential water resources for the local community while also minimizing the risk of flooding. The dam has not been modified in recent years and does not fall under the jurisdiction of the U.S. Army Corps of Engineers, making it solely regulated by state agencies. Despite its age, A C Lincoln continues to play a vital role in water management and conservation efforts in Hill County, Montana.
In the event of an emergency, the dam is equipped with an Emergency Action Plan (EAP) to guide response efforts and ensure public safety. While the specifics of the EAP and risk management measures are not currently available, the dam remains a critical infrastructure for the region's water supply and environmental sustainability. Enthusiasts of water resources and climate will find A C Lincoln to be a fascinating example of how dams can serve multiple purposes while being managed effectively at the state level.
Year Completed |
1930 |
Dam Length |
684 |
Dam Height |
31 |
River Or Stream |
TR-BLACK COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
129 |
Hazard Potential |
Low |
Nid Height |
31 |
Seasonal Comparison
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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.
A C Lincoln