Terry Sewage Ponds Reservoir Report

Last Updated: December 7, 2025

Terry Sewage Ponds, located in Fallon, Montana, were completed in 1963 and are managed by the local government.


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Summary

These ponds serve as offstream storage for the Yellowstone River and have a low hazard potential with a dam height of 11 feet and a storage capacity of 154 acre-feet. The primary purpose of these earth dams is categorized as "Other," and they are regulated by the Department of Natural Resources and Conservation (DNRC) in Montana.

Despite being a sewage facility, Terry Sewage Ponds play a crucial role in water resource management and climate resilience in the region. The ponds have not been rated for condition assessment and have not undergone recent inspections; however, they are designed to meet state regulatory standards for permitting, inspection, and enforcement. With a surface area and drainage area not specified, the ponds provide essential storage for wastewater and contribute to the overall water quality and ecosystem health in the area.

As water resource and climate enthusiasts, understanding the infrastructure and management of facilities like Terry Sewage Ponds is essential for sustainable water management practices. These ponds serve as a reminder of the interconnectedness between water resources, infrastructure, and environmental stewardship. By staying informed about the condition and regulation of such facilities, individuals can advocate for sustainable water policies and practices that protect both water resources and the climate.

Year Completed

1963

Dam Length

2375

Dam Height

11

River Or Stream

YELLOWSTONE RIVER-OFFSTREAM

Primary Dam Type

Earth

Hydraulic Height

11

Nid Storage

154

Hazard Potential

Low

Nid Height

11
       
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.