Haymaker Dam Reservoir Report

Last Updated: December 5, 2025

Haymaker Dam, located in Twodot, Montana, on Trombone Creek, is a private earth dam completed in 1978 for fire protection, stock, and small fish pond purposes.


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Summary

With a height of 30 feet and a storage capacity of 134 acre-feet, the dam serves as a vital resource for the local community. Although it has a low hazard potential, the dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and undergoes regular inspections to ensure its safety and functionality.

Managed by private owners, Haymaker Dam plays a crucial role in water resource management and climate resilience in the Wheatland County area. Its strategic location and design help mitigate potential risks associated with wildfires and provide a reliable water source for agricultural and recreational activities. The dam's presence highlights the importance of sustainable infrastructure development and the need for proper maintenance to support the region's water security in the face of changing climatic conditions.

As an integral part of the local ecosystem, Haymaker Dam contributes to the conservation of water resources and supports biodiversity in the region. Its construction and management reflect a balance between human needs and environmental protection, showcasing the significance of responsible water infrastructure planning in the context of climate change. By upholding regulatory standards and conducting regular assessments, Haymaker Dam stands as a testament to effective water resource management practices in Montana.

Year Completed

1978

Dam Length

550

Dam Height

30

River Or Stream

TROMBONE CREEK

Primary Dam Type

Earth

Hydraulic Height

30

Nid Storage

134

Hazard Potential

Low

Nid Height

30
       
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.