Nnn Ranch #1 Reservoir Report
Nearby: Nnn Ranch #2 Montana #13
Last Updated: December 6, 2025
Nnn Ranch #1 is a privately owned earth dam located in Rosebud, Montana, specifically in the city of Forsyth.
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Summary
Built in 1960, this dam serves multiple purposes including fire protection, stock, and small fish pond management. The dam stands at a height of 8 feet and has a storage capacity of 74 acre-feet, with a normal storage level of 28 acre-feet. Situated on TR-McGinnis Creek, this structure is regulated and inspected by the Montana Department of Natural Resources and Conservation (DNRC), ensuring its compliance with state regulations and maintenance standards.
Despite its low hazard potential, Nnn Ranch #1 has not been rated for its condition assessment, highlighting the need for further evaluation and potentially an emergency action plan (EAP) in case of any unforeseen events. The dam does not have an inundation map prepared or updated emergency contacts, raising concerns about its readiness in emergency situations. While the dam meets state permitting and inspection requirements, there is a lack of detailed risk assessment and management measures in place to address any potential risks associated with its operation and maintenance.
Located within the jurisdiction of the Omaha District of the US Army Corps of Engineers, Nnn Ranch #1 serves as a vital water resource for the local community and surrounding areas. As water resource and climate enthusiasts, it is essential to monitor and evaluate the condition and safety of dams like Nnn Ranch #1 to ensure their continued functionality and resilience in the face of changing environmental conditions.
Year Completed |
1960 |
Dam Length |
100 |
Dam Height |
8 |
River Or Stream |
TR-MCGINNIS CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
8 |
Nid Storage |
74 |
Hazard Potential |
Low |
Nid Height |
8 |
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.
Nnn Ranch #1