Jordan Dam Reservoir Report

Last Updated: December 4, 2025

Jordan Dam, located in Wilsall, Montana, was completed in 1961 by the USDA NRCS and serves primarily for irrigation purposes on the TR-Antelope Creek.


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Summary

With a height of 38 feet and a hydraulic height of 35 feet, the dam has a storage capacity of 1,260 acre-feet and covers a surface area of 87 acres. Despite its significant storage capacity, the dam has a poor condition assessment and is classified as having a high hazard potential.

The dam, owned privately, is regulated by the State of Montana through the Department of Natural Resources and Conservation (DNRC). It is subject to state permitting, inspection, and enforcement, ensuring compliance with safety standards. However, the last inspection was conducted in 2015, indicating a potential need for more frequent assessments to address the poor condition and high hazard potential of the structure.

For water resource and climate enthusiasts, Jordan Dam represents a critical infrastructure supporting agriculture in the region. Its location in Park County, Montana, makes it a key component of the local irrigation system. As discussions around water resource management and climate resilience continue to gain importance, the condition and safety of dams like Jordan Dam will be crucial in ensuring sustainable water usage and mitigating risks associated with potential dam failures.

Year Completed

1961

Dam Length

650

Dam Height

38

River Or Stream

TR-ANTELOPE CREEK

Primary Dam Type

Earth

Surface Area

87

Hydraulic Height

35

Drainage Area

3.3

Nid Storage

1260

Hazard Potential

High

Nid Height

38
       
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.