Big Timber #50 Reservoir Report
Nearby: Schiffer #6 Big Timber #5
Last Updated: December 6, 2025
Big Timber #50 is a private water resource located in Rosebud, Montana, designed by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
The earth dam, completed in 1950, stands at a height of 18 feet and stretches 650 feet in length, providing a storage capacity of 86 acre-feet and a maximum discharge of 120 cubic feet per second. Situated on Blacktail Creek, this dam plays a crucial role in its drainage area of 3.59 square miles.
With a low hazard potential and a moderate risk assessment, Big Timber #50 is regulated by the DNRC and subject to state permitting, inspection, and enforcement. The uncontrolled spillway, with a width of 12 feet, helps manage water flow in case of overflow. While the condition assessment is not rated, the dam's emergency action plan status and risk management measures are yet to be determined. Despite its age, this vital water resource continues to serve the community of Forsyth and its surrounding areas in providing essential water management and storage capabilities.
Year Completed |
1950 |
Dam Length |
650 |
Dam Height |
18 |
River Or Stream |
BLACKTAIL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Drainage Area |
3.59 |
Nid Storage |
86 |
Hazard Potential |
Low |
Nid Height |
18 |
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 #50