Triple Crossing Reservoir Report
Last Updated: January 11, 2026
Triple Crossing, located in Nashua, Montana, is a privately owned dam on Lone Tree Creek that serves the primary purpose of flood risk reduction.
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Summary
Completed in 1961, this earthen dam stands at a height of 35 feet and has a length of 2,313 feet, providing a maximum storage capacity of 6,272 acre-feet with a normal storage of 4,358 acre-feet. Despite its low hazard potential, the dam is state regulated and inspected by the Montana Department of Natural Resources and Conservation (DNRC), ensuring its structural integrity and safety.
Situated in Valley County, Triple Crossing plays a crucial role in mitigating flood risks in the area, with a maximum discharge capacity of 2,140 cubic feet per second. While the dam's condition assessment is currently not rated, its emergency action plan (EAP) status and risk assessment measures remain undisclosed. With no associated structures and a lack of detailed information on its risk management measures, Triple Crossing stands as a key infrastructure for water resource management in the region, under the jurisdiction of the state of Montana and the Omaha District of the US Army Corps of Engineers.
Overall, Triple Crossing stands as a vital piece of infrastructure in the flood-prone region of Nashua, Montana, serving to reduce the risk of flooding along Lone Tree Creek. With its state-regulated status, regular inspections, and low hazard potential, the dam stands as a testament to effective flood risk reduction measures in the area. As water resource and climate enthusiasts, understanding the importance of dams like Triple Crossing in maintaining the safety and resilience of local communities is crucial for sustainable water management practices in the face of changing climate patterns.
Year Completed |
1961 |
Dam Length |
2313 |
Dam Height |
35 |
River Or Stream |
LONE TREE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
35 |
Nid Storage |
6272 |
Hazard Potential |
Low |
Nid Height |
35 |
Seasonal Comparison
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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.
Triple Crossing