Triple Crossing Detention Dam Reservoir Report
Nearby: Triple Crossing Dividend
Last Updated: December 20, 2025
Located in Montana, the Triple Crossing Detention Dam is a gravity dam designed for flood risk reduction along the Willow Creek and Milk River.
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Summary
Built in 1957 by the Bureau of Land Management, this federal-owned structure stands at a structural height of 34 feet with a hydraulic height of 29 feet, offering a maximum storage capacity of 2977.9 acre-feet on its 376-acre surface area.
Despite its low hazard potential, the dam's condition assessment has been rated as poor, highlighting the need for maintenance and repairs. The last inspection in October 2017 revealed the need for improvements to ensure the dam's continued safety and functionality. With a very high risk assessment rating and no emergency action plan in place, the Triple Crossing Detention Dam serves as a crucial reminder of the ongoing challenges faced by water resource and climate enthusiasts in managing and maintaining critical infrastructure for flood control and water management.
Year Completed |
1957 |
Dam Length |
2328 |
River Or Stream |
WILLOW CK./MILK RIVER |
Primary Dam Type |
Gravity |
Surface Area |
376 |
Hydraulic Height |
29 |
Drainage Area |
43 |
Nid Storage |
2977.9 |
Structural Height |
34 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
34 |
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.
Triple Crossing Detention Dam