Fox Reservoir Report

Last Updated: December 5, 2025

Fox, Bill Irrigation, also known as Fox Dam, is a privately owned irrigation structure located in Twodot, Montana.


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Summary

Constructed in 1941 by the USDA NRCS, this earth dam stands at a height of 20 feet and has a length of 820 feet, providing irrigation water from Alkali Creek to the surrounding agricultural lands. With a storage capacity of 237 acre-feet and a maximum discharge of 1200 cubic feet per second, this dam plays a crucial role in supporting the local farming community.

Managed by the Montana Department of Natural Resources and Conservation (DNRC), Fox, Bill Irrigation is state-regulated, inspected, and enforced to ensure its safety and functionality. Despite being classified as having a low hazard potential and not yet rated in its condition assessment, the dam continues to serve its primary purpose of irrigation effectively. With a spillway width of 50 feet and a surface area of 30 acres, this structure demonstrates a commitment to sustainable water resource management in the region.

Located in Wheatland County, Montana, Fox, Bill Irrigation is a testament to the collaboration between private landowners, government agencies, and community stakeholders in maintaining and enhancing water infrastructure for agricultural purposes. As climate change impacts water availability and quality, structures like Fox Dam play a vital role in ensuring the resilience of local ecosystems and economies. With ongoing monitoring and management, this irrigation facility remains a key asset for sustainable water resource management in the region.

Year Completed

1941

Dam Length

820

Dam Height

20

River Or Stream

ALKALI CREEK

Primary Dam Type

Earth

Surface Area

30

Hydraulic Height

20

Drainage Area

3.13

Nid Storage

237

Hazard Potential

Low

Nid Height

20
       
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.