Silver Swan Reservoir Report
Nearby: Gordon Cattle Company #3 Br-57
Last Updated: January 12, 2026
Silver Swan is a privately owned earth dam located in Chapman, Montana, along the TR-Woody Island Coulee river.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1945, this dam serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a height of 15 feet and a length of 300 feet, Silver Swan has a storage capacity of 69 acre-feet and is primarily regulated by the Montana Department of Natural Resources and Conservation (DNRC).
Despite its low hazard potential, Silver Swan is not currently rated for its condition assessment. The dam has not been inspected recently, and important emergency preparedness measures such as an Emergency Action Plan (EAP) and inundation maps are not in place. It is crucial for the owners of Silver Swan to prioritize the safety and maintenance of this structure to ensure its continued functionality and protection of surrounding areas in the event of an emergency.
As water resource and climate enthusiasts, the data for Silver Swan underscores the importance of proactive monitoring, maintenance, and emergency preparedness for dams in Montana. By addressing the current gaps in inspection, condition assessment, and emergency planning, the owners of Silver Swan can enhance the resilience of this vital infrastructure and contribute to the sustainable management of water resources in the region.
Year Completed |
1945 |
Dam Length |
300 |
Dam Height |
15 |
River Or Stream |
TR-WOODY ISLAND COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
69 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Battle Creek Near Chinook Mt
|
12cfs |
Milk River Near Harlem Mt
|
69cfs |
Clear Creek Near Chinook Mt
|
21cfs |
Milk River Near Dodson Mt
|
68cfs |
Peoples Creek Near Hays Mt
|
4cfs |
Milk River At Havre Mt
|
29cfs |
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.
Silver Swan