7-B Reservoir Reservoir Report
Nearby: Jones Creek Harold #3
Last Updated: December 5, 2025
7-B Reservoir, located in Garfield County, Montana, is a privately-owned irrigation reservoir designed by USDA NRCS and completed in 1945.
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Summary
With a dam height of 36 feet and a storage capacity of 200 acre-feet, this earth dam structure on TR-Indian Creek serves the primary purpose of irrigation. The reservoir has a normal storage capacity of 128 acre-feet and a maximum discharge of 100 cubic feet per second, providing vital water resources for agricultural activities in the region.
Managed by the DNRC and regulated by the state of Montana, 7-B Reservoir has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite lacking detailed information on inspection frequency and emergency preparedness, the reservoir is essential for sustaining the local ecosystem and supporting agricultural operations. Situated in a picturesque location with a spillway width of 20 feet, the reservoir plays a crucial role in water resource management in the area.
As a key water infrastructure in the region, the 7-B Reservoir underscores the importance of sustainable water resource management and climate resilience. With its strategic location and historical significance dating back to the mid-20th century, this reservoir continues to be a valuable asset for irrigation and environmental conservation efforts in Montana. As water resource and climate enthusiasts, understanding the vital role of structures like the 7-B Reservoir is essential for promoting sustainable water use and mitigating the impacts of climate change on regional water systems.
Year Completed |
1945 |
Dam Length |
425 |
Dam Height |
36 |
River Or Stream |
TR-INDIAN CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
36 |
Drainage Area |
1.02 |
Nid Storage |
200 |
Hazard Potential |
Low |
Nid Height |
36 |
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.
7-B Reservoir