T L Johnson #5 Reservoir Report
Nearby: Donley Reservoir (Rosebud) Harstad #1
Last Updated: December 7, 2025
T L Johnson #5 is a private dam located in Rosebud County, Montana, specifically in the city of Forsyth.
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Summary
Completed in 1948, this earth dam stands at a height of 15 feet and has a primary purpose of providing fire protection, stock, or creating a small fish pond. The dam has a normal storage capacity of 25 acre-feet and a maximum storage capacity of 64 acre-feet, making it an important resource for water management in the area.
Situated on TR-Living Ash Creek, T L Johnson #5 is under the jurisdiction of the Montana Department of Natural Resources and Conservation (DNRC), with the state regulating, inspecting, and enforcing dam safety measures. With a low hazard potential and a condition assessment that is not rated, this dam serves as a vital structure for both water resource management and climate resilience in the region. Despite not being owned or funded by federal agencies, T L Johnson #5 plays a crucial role in providing essential services for the local community and ecosystem.
As an integral part of the water infrastructure in the area, T L Johnson #5 serves not only as a fire protection resource but also as a valuable asset for stock watering and recreational purposes. With its low hazard potential and state-regulated safety measures, this dam represents a sustainable and reliable water resource for the residents of Rosebud County, Montana. Climate enthusiasts and water resource managers alike can appreciate the importance of structures like T L Johnson #5 in ensuring the efficient and safe utilization of water for various purposes.
Year Completed |
1948 |
Dam Length |
150 |
Dam Height |
15 |
River Or Stream |
TR-LIVING ASH CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
64 |
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.
T L Johnson #5