B B Naylor Reservoir Report

Last Updated: December 5, 2025

Located in Crow Agency, Montana, the B B Naylor dam serves multiple purposes including fire protection, stock watering, and creating a small fish pond.


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Summary

This private earth dam, completed in 1933, stands at a height of 15 feet and has a storage capacity of 78 acre-feet. Despite its low hazard potential, the dam is regulated by the Department of Natural Resources and Conservation (DNRC) and meets state permitting, inspection, and enforcement requirements.

The B B Naylor dam, situated on TR-Custer Creek, is owned and operated by a private entity and falls under state jurisdiction for regulation. With a maximum storage capacity of 78 acre-feet and a normal storage level of 23 acre-feet, the dam plays a crucial role in providing water resources for fire protection and livestock needs in the area. Its structure, although not rated for condition assessment, is monitored for safety and compliance with state regulations.

Although not under the purview of federal agencies, the B B Naylor dam contributes to water resource management in Big Horn County, Montana. Its historical significance, combined with its practical utility for fire protection and stock watering, makes it an essential piece of infrastructure in the region. As climate change impacts water availability, the maintenance and regulation of dams like B B Naylor become increasingly important for sustainable water resource management.

Year Completed

1933

Dam Length

300

Dam Height

15

River Or Stream

TR-CUSTER CREEK

Primary Dam Type

Earth

Hydraulic Height

15

Nid Storage

78

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.