Big Timber #7 Reservoir Report
Nearby: J-K-Boyd #1 Bethel College #3
Last Updated: December 6, 2025
Big Timber #7 is a privately owned earth dam located in Rosebud, Montana, specifically in the city of Forsyth.
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Summary
Built in 1945, this dam serves multiple purposes including fire protection, stock, and small fish pond. With a height of 14 feet and a length of 200 feet, Big Timber #7 has a storage capacity of 60 acre-feet, with a normal storage level of 29 acre-feet.
Situated on TR-West Blacktail Creek, this dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected, permitted, and enforced by the state. Despite its low hazard potential and current "Not Rated" condition assessment, the dam does not have an Emergency Action Plan (EAP) in place, indicating a potential area for improvement in emergency preparedness. The dam is under the jurisdiction of Congressional District 00 in Montana and falls under the responsibility of Representative Greg Gianforte (R).
For water resource and climate enthusiasts, Big Timber #7 presents an interesting case study of a privately owned dam with multiple purposes and regulatory oversight. As a key infrastructure for fire protection and water storage, this dam's management and potential risk factors could be of interest for further study in the realm of water resource management and climate adaptation.
Year Completed |
1945 |
Dam Length |
200 |
Dam Height |
14 |
River Or Stream |
TR-WEST BLACKTAIL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
14 |
Nid Storage |
60 |
Hazard Potential |
Low |
Nid Height |
14 |
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.
Big Timber #7