Plentywood Sewage Lagoon Reservoir Report
Nearby: Box Elder Creek Dam Marsh Dam
Last Updated: December 20, 2025
Plentywood Sewage Lagoon, situated in Sheridan County, Montana, is a significant water resource infrastructure owned by the local government.
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Summary
This sewage lagoon is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is considered a state-jurisdiction facility. The lagoon was completed in 1954 and serves as a vital component of the local wastewater management system.
Constructed as an earth dam with a height of 9 feet and a storage capacity of 200 acre-feet, Plentywood Sewage Lagoon plays a crucial role in treating and managing wastewater from the city of Homestead. With a low hazard potential and a "Not Rated" condition assessment, the lagoon is designed to operate efficiently and effectively. While specific inspection and maintenance details are not provided, the lagoon's primary purpose is identified as "Other," highlighting its importance in supporting environmental health and water quality in the region.
Located near the TR-Big Muddy Creek and serving as a key water infrastructure in the area, Plentywood Sewage Lagoon contributes to the overall water resource management efforts in Montana. As a state-regulated facility with state permitting, inspection, and enforcement mechanisms in place, this lagoon underscores the importance of sustainable water management practices in safeguarding public health and the environment.
Year Completed |
1954 |
Dam Length |
3000 |
Dam Height |
9 |
River Or Stream |
TR-BIG MUDDY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
6 |
Nid Storage |
200 |
Hazard Potential |
Low |
Nid Height |
9 |
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.
Plentywood Sewage Lagoon