East Fork Reservoir Report

Last Updated: December 5, 2025

East Fork is a federal-owned recreational dam located in Hill, Montana, along the East Fork Beaver Creek.


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Summary

Managed by the Bureau of Indian Affairs, this Earth dam stands at a structural height of 65 feet and was completed in 2007, providing a storage capacity of 667 acre-feet. With a controlled spillway and a high hazard potential rating, East Fork offers a picturesque setting for outdoor enthusiasts to enjoy activities such as fishing, boating, and hiking.

Despite its remote location, East Fork is a popular destination for water resource and climate enthusiasts looking to explore the natural beauty of Montana. The dam, which is not regulated by the state, offers a glimpse into the importance of water management for recreation purposes. With its risk assessment rating of Very High (1), the dam's emergency action plan is crucial for ensuring public safety in the event of a potential hazard.

Featuring a unique blend of scenic landscapes and water management infrastructure, East Fork serves as a valuable resource for studying the intersection of environmental conservation and recreational activities. As visitors engage with the dam's designated purposes and high-risk potential, they are reminded of the delicate balance needed to protect our water resources while promoting sustainable outdoor recreation opportunities in the region.

Year Completed

2007

Dam Length

330

River Or Stream

EAST FORK BEAVER CREEK

Primary Dam Type

Earth

Nid Storage

667

Structural Height

65

Hazard Potential

High

Nid Height

65
       
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.