Sweo Reservoir Report
Nearby: Blatter Vr-77 Retention Dam
Last Updated: December 6, 2025
Sweo is a privately owned earth dam located in Valley County, Montana, specifically on the TR-Morgan Creek.
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Summary
Constructed in 1945 by the USDA NRCS, this dam stands at 19 feet tall and has a length of 125 feet, providing fire protection and serving as a stock or small fish pond. With a storage capacity of 186 acre-feet, Sweo is primarily used for these purposes and is regulated by the Montana Department of Natural Resources Conservation (DNRC).
Despite being classified as having a low hazard potential, Sweo is not currently rated for its condition assessment. The dam has not been inspected recently, and there is limited information available on its emergency action plan (EAP) and risk management measures. While the dam meets state permitting and inspection requirements, further assessment and preparation of necessary documentation, such as inundation maps and emergency contacts, may be needed to ensure compliance and safety.
As an essential water resource structure in the area, Sweo plays a crucial role in providing fire protection and supporting local livestock and aquatic ecosystems. However, with limited information on its current condition and emergency preparedness, continued monitoring and evaluation of Sweo's safety and regulatory compliance are necessary to prevent potential risks and ensure sustainable water resource management in the future.
Year Completed |
1945 |
Dam Length |
125 |
Dam Height |
19 |
River Or Stream |
TR-MORGAN CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
19 |
Drainage Area |
1.83 |
Nid Storage |
186 |
Hazard Potential |
Low |
Nid Height |
19 |
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.
Sweo