Robert Johnson Reservoir Report
Nearby: A Peterson Peterson (Richland)
Last Updated: December 13, 2025
Robert Johnson is a privately owned earth dam located in Richland County, Montana, along the TR-North Fork First Hay Creek.
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Summary
Built in 1937 by the USDA NRCS, this dam stands at 17 feet in height and is primarily used for fire protection, stock, and small fish pond purposes. With a storage capacity of 83 acre-feet and a drainage area of 1.09 square miles, Robert Johnson plays a crucial role in water resource management in the region.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Robert Johnson has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. Despite its age, the dam has not undergone any modifications over the years and does not have an Emergency Action Plan in place. With a maximum discharge capacity of 300 cubic feet per second and a spillway width of 30 feet, Robert Johnson is equipped to handle potential flood events and ensure the safety of the surrounding area.
Situated in a remote location with no associated structures, Robert Johnson serves as a vital water resource infrastructure for the community. As climate change continues to impact water availability and quality, it is essential to monitor and maintain dams like Robert Johnson to safeguard against potential risks and ensure sustainable water management practices for future generations.
Year Completed |
1937 |
Dam Length |
350 |
Dam Height |
17 |
River Or Stream |
TR-NORTH FORK FIRST HAY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Drainage Area |
1.09 |
Nid Storage |
83 |
Hazard Potential |
Low |
Nid Height |
17 |
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.
Robert Johnson