Nnn Ranch #2 Reservoir Report
Last Updated: December 6, 2025
Nnn Ranch #2 is a private irrigation dam located in Rosebud, Montana, along the TR-McGinnis Creek.
°F
°F
mph
Wind
%
Humidity
Summary
Constructed in 1959, this earth dam stands at 10 feet tall and has a storage capacity of 60 acre-feet. The primary purpose of Nnn Ranch #2 is to support irrigation activities in the area, making it a crucial resource for water management in the region.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Nnn Ranch #2 is regulated, inspected, and enforced by the state authorities to ensure its safety and compliance with regulations. Despite being classified as low hazard potential, the dam has not been rated for its current condition. The dam's emergency action plan (EAP) status, risk assessment, and management measures are also not documented, suggesting potential gaps in emergency preparedness.
Located within Congressional District 00 in Montana and owned by a private entity, Nnn Ranch #2 serves as a vital water infrastructure for agricultural activities in the area. With its historical significance and ongoing role in irrigation, this dam represents a key component of water resource management in the region, calling for continued monitoring and maintenance to ensure its safety and functionality for years to come.
Year Completed |
1959 |
Dam Length |
125 |
Dam Height |
10 |
River Or Stream |
TR-MCGINNIS CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
10 |
Nid Storage |
60 |
Hazard Potential |
Low |
Nid Height |
10 |
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.
Upper Big Nemaha 6-A