Pn Grazing Association #1 Reservoir Report

Last Updated: December 5, 2025

Located in Fergus County, Montana, the Pn Grazing Association #1 is a privately owned earth dam built in 1953 for fire protection, stock, and small fish pond purposes.


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Summary

With a height of 15 feet and a length of 250 feet, the dam has a storage capacity of 64 acre-feet, with a normal storage level of 25 acre-feet. Situated along the TR-JUDITH RIVER, this dam is under the jurisdiction of the Montana Department of Natural Resources and Conservation (DNRC) and is subject to state regulations, permitting, inspection, and enforcement.

Despite its low hazard potential, the condition of the Pn Grazing Association #1 dam is currently not rated, highlighting the need for further assessment and potential maintenance to ensure its safety and functionality. While the dam has not been inspected recently, its emergency action plan (EAP) status, risk assessment, and risk management measures are all currently unreported. Nevertheless, the dam serves as a crucial resource for the surrounding area, providing protection against wildfires and supporting local livestock and fisheries.

With its strategic location and vital purposes, the Pn Grazing Association #1 dam stands as a key asset in the region, contributing to water resource management and climate resilience efforts. As water resource and climate enthusiasts, staying informed about the condition and management of such infrastructure is essential in safeguarding the environment and ensuring sustainable water use for years to come.

Year Completed

1953

Dam Length

250

Dam Height

15

River Or Stream

TR-JUDITH RIVER

Primary Dam Type

Earth

Hydraulic Height

15

Nid Storage

64

Hazard Potential

Low

Nid Height

15
       
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.