Upper Prairie Goat Det. Dam Reservoir Report

Last Updated: December 8, 2025

The Upper Prairie Goat Detention Dam, located in Glendive, Montana, was completed in 1962 by the Bureau of Land Management for fire protection, stock, and small fish pond purposes.


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Summary

This gravity dam stands at a hydraulic height of 25 feet and a structural height of 31 feet, with a length of 361 feet and a storage capacity of 133.48 acre-feet. The dam is situated on Cedar Creek and the Yellowstone River, serving as a vital resource for water management in the area.

Despite its low hazard potential, the dam's condition assessment is currently marked as unsatisfactory, indicating a need for maintenance and potential improvements. The last inspection date was in August 2016, with an inspection frequency of 5 years. The risk assessment for the dam is moderate, highlighting the importance of ongoing monitoring and risk management measures to ensure the safety and efficiency of this essential water resource infrastructure. For water resource and climate enthusiasts, the Upper Prairie Goat Detention Dam represents a key component of the region's water management system, showcasing the intricate balance between water supply, environmental conservation, and infrastructure maintenance in the face of changing climate conditions.

Year Completed

1962

Dam Length

361

River Or Stream

CEDAR CK./YELLOSTONE RIVER

Primary Dam Type

Gravity

Surface Area

14.2

Hydraulic Height

25

Nid Storage

133.48

Structural Height

31

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

31
       
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.