Willow Creek Bor Mt - Dike 5 Reservoir Report

Last Updated: December 5, 2025

Willow Creek Bor Mt - Dike 5 is a significant federal-owned structure located in Lewis and Clark County, Montana, near the city of Great Falls.


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Summary

This earth dam, completed in 1940 by the Bureau of Reclamation, serves the primary purpose of irrigation for the surrounding area. With a height of 23 feet and a length of 420 feet, the dam has a storage capacity of 39,800 acre-feet and a maximum discharge of 20,000 cubic feet per second.

The dam's spillway type is uncontrolled, with a width of 700 feet, and it poses a high hazard potential. Despite its age, the condition of the dam is currently listed as "Not Available," and it undergoes inspections annually by the Bureau of Reclamation. The Emergency Action Plan (EAP) status and risk management measures for this structure are not specified in the data, but the risk assessment indicates a moderate risk level.

Overall, Willow Creek Bor Mt - Dike 5 plays a crucial role in water resource management in the region, providing irrigation water for agricultural purposes. As a key infrastructure under federal ownership, the dam's safety and maintenance are closely monitored to ensure its continued functionality and to mitigate any potential risks associated with its operation.

Year Completed

1940

Dam Length

420

Dam Height

23

River Or Stream

SUN RIVER-TR

Primary Dam Type

Earth

Hydraulic Height

10

Nid Storage

39800

Structural Height

23

Hazard Potential

High

Foundations

Rock

Nid Height

23
       
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.