Plethora Reservoir Report
Nearby: Herman #1 Chicken Of The Sea
Last Updated: December 5, 2025
Plethora, located in Dodson, Montana, is a privately-owned earth dam completed in 1965 with a primary purpose of providing fire protection, stock, and a small fish pond.
°F
°F
mph
Wind
%
Humidity
Summary
This dam, standing at a height of 12 feet and stretching 535 feet in length, holds a maximum storage capacity of 152 acre-feet and a normal storage of 36 acre-feet. Situated on the TR-Assiniboine Creek, Plethora is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected, permitted, and enforced by state agencies.
With a low hazard potential and a current condition assessment of "Not Rated", Plethora serves as a vital resource for water storage in the region. The dam has a maximum discharge capacity of 575 cubic feet per second and plays a crucial role in fire protection and reservoir purposes. Despite not having a designated emergency action plan or inundation maps prepared, Plethora continues to provide essential services to the local community while adhering to state regulations and inspections.
As a key feature in the local landscape, Plethora underscores the importance of responsible water resource management in the face of changing climate conditions. Its strategic location and purpose highlight the significance of maintaining infrastructure to ensure water security for both human and environmental needs in the region. With its historical significance and ongoing operational role, Plethora stands as a testament to the intersection of water resources, climate resilience, and community well-being.
Year Completed |
1965 |
Dam Length |
535 |
Dam Height |
12 |
River Or Stream |
TR-ASSINIBOINE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
12 |
Nid Storage |
152 |
Hazard Potential |
Low |
Nid Height |
12 |
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.
Plethora