Swan Dam Reservoir Report
Nearby: Hunky Dorie Rocky Mountain High
Last Updated: December 21, 2025
Located in Toole, Montana, Swan Dam is a gravity dam constructed in 2003 with a height of 16 feet and a hydraulic height of 12 feet.
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Summary
Owned and operated by the Bureau of Land Management, this dam serves as a water storage structure with a capacity of 362.53 acre-feet and a surface area of 64.45 acres. Despite its low hazard potential, Swan Dam has not been rated for its condition as of yet.
The dam, designed with buttress and stone core types, plays a crucial role in water resource management in the region. While it has not been modified in recent years, Swan Dam undergoes inspections every five years to ensure its structural integrity and safety. The emergency preparedness measures, including the existence of an Emergency Action Plan, have not been explicitly documented for this dam.
Swan Dam represents a significant federal investment by the Bureau of Land Management in maintaining water resources and addressing climate-related challenges in Montana. As a vital piece of infrastructure, this dam stands as a testament to the ongoing efforts to secure water supply and mitigate risks associated with potential emergencies. Its strategic location and design highlight the importance of sustainable water management practices in the face of changing climate patterns.
Year Completed |
2003 |
Dam Length |
713 |
Primary Dam Type |
Gravity |
Surface Area |
64.45 |
Hydraulic Height |
12 |
Nid Storage |
362.53 |
Structural Height |
16 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
16 |
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.
Swan Dam