Hubbart Reservoir Report
Nearby: Averill Little Bitterroot
Last Updated: December 5, 2025
Hubbart is a concrete dam located on the Little Bitterroot River in Flathead, Montana.
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Summary
Built in 1923, it stands at a structural height of 130 feet and has a length of 503 feet. The dam's primary purpose is irrigation, with a storage capacity of 12,000 acre-feet. It is owned and operated by the Bureau of Indian Affairs, making it a Federal-owned structure.
The dam is classified as having a high hazard potential and a very high risk assessment rating. Despite its age, the condition assessment is listed as "Not Available," with the last inspection date recorded in 2012. The Emergency Action Plan (EAP) status is also not provided, raising concerns about the readiness and response capabilities in case of an emergency. With no state regulatory oversight or permitting, it is crucial for the Federal agency to ensure the safety and maintenance of this critical water resource infrastructure.
Hubbart Dam's location in the Seattle District underlines its significance in the region's water management system. As an essential component for irrigation, it plays a vital role in supporting agricultural activities in the area. With the potential risks associated with the dam highlighted, there is a pressing need for regular inspections, maintenance, and emergency preparedness measures to safeguard both the structure and the surrounding community from any potential hazards or risks posed by the dam.
Year Completed |
1923 |
Dam Length |
503 |
River Or Stream |
LITTLE BITTERROOT RIVER |
Primary Dam Type |
Concrete |
Nid Storage |
12000 |
Structural Height |
130 |
Hazard Potential |
High |
Nid Height |
130 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Mill Cr Ab Bassoo Cr Nr Niarada Mt
|
2cfs |
Flathead River Near Polson Mt
|
8210cfs |
Thompson River Near Thompson Falls Mt
|
128cfs |
Clark Fork Near Plains Mt
|
11300cfs |
Swan River Near Bigfork Mt
|
575cfs |
Prospect Creek At Thompson Falls Mt
|
76cfs |
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.
Hubbart