Osterized Reservoir Report

Last Updated: December 5, 2025

Osterized is a private dam located in Chouteau, Montana, along the Alkali Coulee river.


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Summary

Built in 1908, this earth dam stands at a height of 11 feet and has a storage capacity of 170 acre-feet, primarily serving purposes such as fire protection, stock watering, and small fish pond management. While the dam is regulated and inspected by the Montana Department of Natural Resources and Conservation (DNRC), its hazard potential is considered low and its condition assessment is currently not rated.

With a maximum storage capacity of 170 acre-feet and a normal storage level of 44 acre-feet, Osterized plays a crucial role in providing water resources for fire protection and agricultural activities in the surrounding area. The dam's location in a rural setting and its low hazard potential make it a key asset for local water management and conservation efforts. Although the dam has not been assessed for its condition recently, its historical significance and continued functionality highlight its importance in sustaining water resources and supporting the local ecosystem.

As an essential feature of the water infrastructure in Chouteau, Montana, Osterized represents a unique blend of historical significance and practical utility. Managed by private owners, the dam contributes to the resilience of the local community by providing reliable water sources for various purposes. With its low hazard potential and regulated status, Osterized stands as a testament to responsible water resource management and serves as a valuable asset for addressing the water needs of the region in the face of changing climate conditions.

Year Completed

1908

Dam Length

150

Dam Height

11

River Or Stream

ALKALI COULEE

Primary Dam Type

Earth

Hydraulic Height

11

Nid Storage

170

Hazard Potential

Low

Nid Height

11
       
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.