Corral Junction Detention #2 Dam Reservoir Report
Last Updated: December 21, 2025
Corral Junction Detention #2 Dam, located in Valley County, Montana, was completed in 1954 by the Bureau of Land Management to primarily serve as a flood risk reduction structure along Willow Creek and the Milk River.
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Summary
This gravity-type dam has a hydraulic height of 19 feet and a structural height of 20 feet, with a length of 1662 feet and a storage capacity of 592.5 acre-feet. Despite its low hazard potential, the dam's condition assessment is listed as unsatisfactory, indicating a need for maintenance and improvements to ensure its long-term effectiveness.
The dam's spillway type is uncontrolled, with a width of 3 feet, and it is currently not regulated or inspected by the state authorities. While the risk assessment for Corral Junction Detention #2 Dam is moderate, there are no emergency action plans in place, raising concerns about the preparedness for potential incidents. With its proximity to the city of Nashua and a drainage area of 13.3 square miles, the dam plays a crucial role in mitigating flood risks in the region.
As water resource and climate enthusiasts continue to monitor the condition and management of Corral Junction Detention #2 Dam, it is essential for federal agencies like the Bureau of Land Management to address any deficiencies and ensure the dam's integrity for the safety of surrounding communities and the protection of valuable water resources. Ongoing inspection and maintenance efforts are necessary to uphold the dam's functionality and prevent any potential hazards associated with its operation.
Year Completed |
1954 |
Dam Length |
1662 |
River Or Stream |
WILLOW CK./MILK RIVER |
Primary Dam Type |
Gravity |
Surface Area |
64.23 |
Hydraulic Height |
19 |
Drainage Area |
13.3 |
Nid Storage |
592.5 |
Structural Height |
20 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
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.
Corral Junction Detention #2 Dam