J B Long And Company #2 Reservoir Report

Last Updated: December 22, 2025

J B Long and Company #2 is a private dam located in Lewis and Clark County, Montana, with a primary purpose of providing fire protection, stock, or a small fish pond.


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Summary

Built in 1930, this earth dam stands at 20 feet high and spans 250 feet in length, with a storage capacity of 81 acre-feet. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected, permitted, and enforced by state authorities, ensuring its safety and compliance with regulations.

Situated in the Omaha District of the US Army Corps of Engineers, J B Long and Company #2 serves as a crucial water resource for the town of Augusta, Montana, offering protection against fire hazards and supporting local livestock and aquatic life. With a low hazard potential and a current condition assessment of "Not Rated," this dam plays a vital role in the community's water management infrastructure. While the structure has not been modified in recent years, its emergency action plan status and risk assessment measures remain undisclosed, raising questions about its preparedness for potential incidents.

Despite lacking specific details on its risk management and emergency response protocols, J B Long and Company #2 stands as a significant feature in Montana's water resource landscape, providing essential services for both human and ecological needs. As water resource and climate enthusiasts, understanding the functionality and regulatory oversight of dams like J B Long and Company #2 is crucial for promoting sustainable water management practices and ensuring the safety and resilience of communities in the face of changing environmental conditions.

Year Completed

1930

Dam Length

250

Dam Height

20

River Or Stream

DIFFUSED SURFACE WATER

Primary Dam Type

Earth

Hydraulic Height

20

Nid Storage

81

Hazard Potential

Low

Nid Height

20
       
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.