Big Timber Sewage Lagoon Reservoir Report
Nearby: Beley Pond Pioneer
Last Updated: December 5, 2025
Big Timber Sewage Lagoon in Montana is a local government-owned facility situated near the Yellowstone River, serving as a crucial component of the state's wastewater management system.
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Summary
Built in 1959, this Earth dam structure stands at 15 feet high and has a storage capacity of 270 acre-feet, providing essential treatment and disposal of sewage for the community of Big Timber. With a low hazard potential and a condition assessment of "Not Rated," the lagoon is regulated and inspected by the Montana Department of Natural Resources and Conservation to ensure compliance with state standards.
Despite its relatively modest size and capacity, Big Timber Sewage Lagoon plays a vital role in safeguarding water resources and the local environment. The lagoon's primary purpose of wastewater treatment underscores its importance in protecting water quality and public health, with regular inspections and enforcement measures in place to maintain operational efficiency and compliance. As part of the state's infrastructure, this facility exemplifies the intersection of water resource management and climate resilience, highlighting the need for sustainable practices in wastewater treatment and disposal.
Located in Sweet Grass County, Montana, Big Timber Sewage Lagoon symbolizes the interconnectedness of water resources, infrastructure, and environmental stewardship. With a focus on effective management and regulation, this facility serves as a model for sustainable wastewater treatment practices in a changing climate. As water enthusiasts and climate advocates, we recognize the critical role that facilities like Big Timber Sewage Lagoon play in maintaining the health and integrity of our water systems, underscoring the importance of ongoing monitoring, maintenance, and adaptation to ensure a sustainable future for generations to come.
Year Completed |
1959 |
Dam Length |
3000 |
Dam Height |
15 |
River Or Stream |
TR-YELLOWSTONE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
11 |
Nid Storage |
270 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Otter Creek FAS
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Big Rock FAS
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Grey Bear FAS
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Pelican FAS
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Big Timber Sewage Lagoon