Hanson #1 Reservoir Report
Nearby: Tonn #2 Failing #3
Last Updated: December 6, 2025
Hanson #1 is a privately-owned dam located in Miles City, Montana on the TR-Pumpkin Creek.
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Summary
Built in 1949, this earth dam stands at a height of 16 feet and has a storage capacity of 108 acre-feet. The primary purposes of this dam are for fire protection, stock watering, and creating a small fish pond. With a low hazard potential and a condition assessment of "Not Rated," Hanson #1 plays a crucial role in local water resource management.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), this dam is regulated, permitted, inspected, and enforced by the state agency. Despite not having a current condition assessment, Hanson #1's emergency action plan (EAP) status, risk assessment, and risk management measures remain unknown. With its location in a congressional district represented by Greg Gianforte, the dam serves as a vital infrastructure for maintaining water resources and supporting the local community.
Although Hanson #1 has not been rated for its condition, its low hazard potential suggests a relatively low risk of failure. However, without up-to-date information on its emergency preparedness and risk assessment, there remains some uncertainty about the dam's resilience to potential threats. As climate change continues to impact water resources, it is essential for stakeholders to prioritize the safety and sustainability of dams like Hanson #1 to ensure the long-term resilience of water infrastructure in the region.
Year Completed |
1949 |
Dam Length |
375 |
Dam Height |
16 |
River Or Stream |
TR-PUMPKIN CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Nid Storage |
108 |
Hazard Potential |
Low |
Nid Height |
16 |
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.
Hanson #1