Johnson Reservoir Report
Nearby: Fowler #1 (Pondera) Hollandsworth
Last Updated: December 5, 2025
Johnson, Howard (Pondera) is a privately owned earth dam located in Loma, Montana, along the TR-DEAD INDIAN COULEE river or stream.
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Summary
Completed in 1939, this dam stands at 15 feet high and stretches 300 feet in length, with a storage capacity of 138 acre-feet. Despite not being rated for condition assessment, the dam is considered to have a significant hazard potential.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Johnson, Howard (Pondera) is under state regulatory jurisdiction with permitting, inspection, and enforcement protocols in place. Although no federal agencies are directly involved with this dam, its primary purpose is classified as 'Other' with a focus on water resource management in the region. The dam's location in Pondera County, Montana, adds to its significance as a key infrastructure for water storage and flood control in the area.
With its historical significance and role in water management, Johnson, Howard (Pondera) serves as a critical structure in the local community. As climate change impacts water resources, monitoring and assessing the condition of dams like Johnson, Howard (Pondera) becomes increasingly important to ensure their safety and effectiveness in the face of evolving environmental challenges.
Year Completed |
1939 |
Dam Length |
300 |
Dam Height |
15 |
River Or Stream |
TR-DEAD INDIAN COULEE |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
15 |
Nid Storage |
138 |
Hazard Potential |
Significant |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Teton River Near Dutton Mt
|
83cfs |
Marias River Near Chester Mt
|
249cfs |
Marias River Near Shelby Mt
|
305cfs |
Lake Creek Near Power Mt
|
30cfs |
Muddy Creek At Vaughn Mt
|
86cfs |
Marias River Near Loma Mt
|
335cfs |
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.
Johnson, Howard (Pondera)