Re-Regulating Reservoir Report

Last Updated: December 5, 2025

Re-Regulating, a privately owned dam located in Fishtail, Montana, on West Rosebud Creek, has been serving multiple purposes since its completion in 1979.


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Summary

With a dam height of 15 feet and a storage capacity of 475 acre-feet, this earth-type structure not only provides water storage but also supports recreational activities in the area. Despite being regulated by the Federal Energy Regulatory Commission, the dam is not subject to state jurisdiction or permitting, highlighting the complex regulatory landscape surrounding water resources in the region.

The dam's controlled spillway and low hazard potential indicate a focus on safety and risk management, with regular inspections ensuring its continued integrity. However, with a very high risk assessment rating of 1, there may be potential challenges and vulnerabilities that need to be addressed in the future. The presence of a single slide gate for outlet control emphasizes the simplicity of the structure's design, yet its impact on the surrounding environment and water flow cannot be underestimated.

As water resource and climate enthusiasts, understanding the nuances of dams like Re-Regulating is crucial for sustainable management of our natural resources. From its role in water storage to its potential risks and regulatory framework, this dam serves as a microcosm of the complex interplay between human infrastructure and the environment. As we strive to balance water needs with ecosystem health and recreational enjoyment, the story of Re-Regulating offers valuable insights into the challenges and opportunities facing water resources in Montana and beyond.

Year Completed

1979

Dam Length

410

Dam Height

15

River Or Stream

West Rosebud Creek

Primary Dam Type

Earth

Surface Area

49

Drainage Area

52

Nid Storage

475

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Nid Height

15
       
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.