Seminoe Reservoir Report
Nearby: Kortes Irene No. 2
Last Updated: December 5, 2025
Seminoe is a Federal-owned dam located in Carbon, Wyoming, along the North Platte River.
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Summary
Built in 1938 by the Bureau of Reclamation, this concrete arch dam stands at a height of 295 feet and serves multiple purposes including hydroelectric power generation, irrigation, and recreation. With a maximum storage capacity of over 1 million acre-feet and a surface area of 20,291 acres, Seminoe plays a crucial role in water resource management in the region.
Despite its age, Seminoe is a well-regulated and inspected structure, with the Bureau of Reclamation overseeing its operation, maintenance, and enforcement. The dam's spillway type is controlled, with a width of 42 feet to manage high discharges. With a high hazard potential due to its location and storage capacity, Seminoe is classified as very high risk (level 1) and is closely monitored for any potential risks or hazards. Overall, Seminoe remains a key component of the water infrastructure in Wyoming, ensuring reliable water supply, power generation, and recreational opportunities for the region.
Year Completed |
1938 |
Dam Length |
530 |
Dam Height |
295 |
River Or Stream |
NORTH PLATTE RIVER |
Primary Dam Type |
Concrete |
Surface Area |
20291 |
Hydraulic Height |
206 |
Drainage Area |
7210 |
Nid Storage |
1017279 |
Structural Height |
295 |
Outlet Gates |
Other Controlled - 3, Valve - 2 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
295 |
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.
Seminoe
Bunker Draw