Bob #8 Reservoir Report
Nearby: Smith Ranch 4 Bob #1
Last Updated: December 6, 2025
Bob #8 is a privately owned dam located in Cohagen, Montana, on the TR-Lone Tree Creek.
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Summary
Built in 1960, this earth dam stands at a height of 20 feet and has a storage capacity of 196 acre-feet for purposes such as fire protection, livestock, and small fish ponds. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected, permitted, and enforced by state authorities.
With a low hazard potential and a "Not Rated" condition assessment, Bob #8 serves as a vital resource for water management in the area. The dam's primary purpose is to provide essential services while ensuring the safety and well-being of the surrounding community. Situated in Garfield County, Montana, this structure plays a crucial role in water resource management and climate resilience efforts in the region.
Despite not being under the jurisdiction of the U.S. Army Corps of Engineers, Bob #8 is a significant component of the local water infrastructure. As a key contributor to fire protection and agricultural activities, this dam underscores the importance of private ownership in maintaining essential water resources for both human and environmental needs. For water resource and climate enthusiasts, Bob #8 represents a valuable case study in sustainable water management practices at the state level.
Year Completed |
1960 |
Dam Length |
250 |
Dam Height |
20 |
River Or Stream |
TR-LONE TREE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
196 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Bob #8