Johnston Reservoir Report
Nearby: Richey, Roy Lee Sa #2
Last Updated: December 7, 2025
Johnston, located in Poplar, Montana, is a private water resource structure primarily used for fire protection, stock, and small fish pond purposes.
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Summary
This earth-type dam, completed in 1954, stands at a height of 30 feet, with a storage capacity of 30 acre-feet. Situated on the TR-Pasture Creek, Johnston serves as a vital asset in the region, ensuring water availability for various needs while also contributing to the local ecosystem.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Johnston is state-regulated, inspected, and enforced to meet safety standards. With a low hazard potential and a condition assessment of "Not Rated," the dam poses minimal risk to its surroundings. While the last inspection date and assessment of emergency preparedness remain unrecorded, Johnston's importance in water management for the area is undeniable, serving as a reliable source for water supply and irrigation needs.
Though lacking detailed data on emergency protocols and risk management measures, Johnston's significance in water resource management in Dawson County, Montana, remains evident. As a focal point for fire protection and livestock support, this structure plays a crucial role in sustaining the local ecosystem and ensuring water availability for various purposes. With its historical significance dating back to the 1950s, Johnston stands as a testament to the ongoing efforts to manage and utilize water resources effectively in the region.
Year Completed |
1954 |
Dam Length |
600 |
Dam Height |
30 |
River Or Stream |
TR-PASTURE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
30 |
Hazard Potential |
Low |
Nid Height |
30 |
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.
Johnston