Hundred Dollar Bill Reservoir Report

Last Updated: December 5, 2025

Hundred Dollar Bill is a state-regulated dam located in the scenic city of Twodot, Montana, along Mud Creek.


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Summary

Built in 1960, this earth dam stands at a height of 20 feet and serves multiple purposes including fire protection, stock, and small fish pond. With a storage capacity of 165 acre-feet, this dam plays a crucial role in water resource management in the area.

Managed by the Montana Department of Natural Resources and Conservation (DNRC), Hundred Dollar Bill has a low hazard potential and has not been rated for its current condition. Despite its age, the dam continues to provide essential services to the local community. The dam's last inspection took place in September 2006, underscoring the importance of regular maintenance and monitoring for ensuring its safety and functionality.

As a key element in the local water infrastructure, Hundred Dollar Bill exemplifies the intersection of water resource management and climate resilience. With its strategic location and multiple benefits, this dam is a testament to the importance of responsible dam ownership and maintenance in safeguarding water resources for future generations.

Year Completed

1960

Dam Length

400

Dam Height

20

River Or Stream

MUD CREEK

Primary Dam Type

Earth

Hydraulic Height

20

Nid Storage

165

Hazard Potential

Low

Nid Height

20
       
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.