Eureka Holding Pond Dike Reservoir Report

Last Updated: December 5, 2025

The Eureka Holding Pond Dike in Montana, completed in 1982, serves as a crucial water resource infrastructure managed by the local government.


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Summary

This earth dam, standing at a height of 40 feet with a hydraulic height of 36 feet, plays a significant role in flood control and water storage in the region. With a storage capacity of 96 acre-feet and a length of 400 feet, the dam ensures the protection of the surrounding area from potential inundation events.

Located in Lincoln County, Montana, the Eureka Holding Pond Dike is regulated and inspected by the state's Department of Environmental Quality (DEQ), ensuring its compliance with safety standards. Despite its high hazard potential and risk assessment rating of 2 (high), the dam's condition is currently not rated. The dam has undergone structural modifications in 1995 and 1999 to enhance its resilience and performance, highlighting the commitment to maintaining the integrity of this critical infrastructure. Water resource and climate enthusiasts can appreciate the significance of the Eureka Holding Pond Dike in safeguarding the local community and environment from potential water-related risks.

Years Modified

1995 - Structural, 1999 - Structural

Year Completed

1982

Dam Length

400

Dam Height

40

River Or Stream

TR-TOBACCO RIVE

Primary Dam Type

Earth

Hydraulic Height

36

Nid Storage

96

Outlet Gates

Valve

Hazard Potential

Significant

Nid Height

40
       
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.