Bassett Reservoir Report
Nearby: Montana #18 L Olson #1
Last Updated: December 6, 2025
Located in Treasure County, Montana, Bassett Dam, also known as Bassett, was completed in 1959 by the USDA NRCS.
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Summary
This privately owned earth dam serves various purposes including fire protection, stock, and small fish pond. With a height of 10 feet and a length of 275 feet, the dam has a storage capacity of 88 acre-feet and a drainage area of 5.47 square miles. The dam is situated on the Geyser Spring Coulee and is regulated by the DNRC, with state permitting, inspection, and enforcement all in place.
Bassett Dam has a low hazard potential and a moderate risk assessment score of 3. While the condition assessment is currently not rated, the dam meets state jurisdiction requirements and is regularly inspected. The spillway, which is uncontrolled with a width of 20 feet, allows for a maximum discharge of 270 cubic feet per second. The dam is designed to withstand potential emergencies, although specific emergency action plans and measures are not currently in place. Bassett Dam is a vital resource for the region, providing essential water storage and protection for local residents and wildlife.
Year Completed |
1959 |
Dam Length |
275 |
Dam Height |
10 |
River Or Stream |
GEYSER SPRING COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
10 |
Drainage Area |
5.47 |
Nid Storage |
88 |
Hazard Potential |
Low |
Nid Height |
10 |
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.
Bassett