Allan #2 Reservoir Report
Nearby: Allen #5 Christensen #3
Last Updated: January 11, 2026
Allan #2 is a privately owned dam located in Miles City, Montana, along Broughton Creek.
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Summary
Built in 1955, this earth dam stands at 24 feet high and stretches 594 feet in length, providing fire protection, stock water, and serving as a small fish pond. With a storage capacity of 79 acre-feet, the dam is crucial for maintaining water resources in the area. It is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected, permitted, and enforced by the state agency to ensure its safety and functionality.
Despite being classified as having a low hazard potential, Allan #2 has not been rated for its condition assessment. The dam has not undergone any modifications over the years, highlighting the importance of regular inspections and maintenance to ensure its integrity. The emergency action plan (EAP) for the dam has not been prepared or updated, raising concerns about the readiness for potential incidents. Climate enthusiasts monitoring water resources in the region should keep an eye on Allan #2 to ensure its continued safe operation and contribution to the local ecosystem.
Overall, Allan #2 plays a vital role in providing water for firefighting, livestock, and wildlife in Custer County, Montana. As a privately owned structure, its management and maintenance are key to its continued function and safety. With the potential impacts of climate change on water resources, it is essential for stakeholders and regulators to monitor and manage dams like Allan #2 to ensure their resilience in the face of changing environmental conditions.
Year Completed |
1955 |
Dam Length |
594 |
Dam Height |
24 |
River Or Stream |
BROUGHTON CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
79 |
Hazard Potential |
Low |
Nid Height |
24 |
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.
Allan #2