Coy Reservoir Report
Last Updated: December 5, 2025
Coy is a privately owned irrigation dam located in Uinta, Wyoming, along Yellow Creek off Channel.
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Summary
Designed by Kenneth E. Hansen and completed in 2009, this earth dam stands at 13 feet high and has a storage capacity of 108 acre-feet. With a normal storage of 80 acre-feet and a drainage area of 43 square miles, Coy plays a crucial role in water resource management in the region.
The dam features a valve outlet with two gates and an uncontrolled spillway that is 4 feet wide. Despite being classified as having a low hazard potential and fair condition assessment, Coy is subject to regular inspections to ensure its structural integrity. The surrounding area, including Meadow Vista Road and nearby communities, benefits from the water supply and flood control provided by this essential infrastructure.
Managed by the Wyoming State Engineer's Office, Coy serves as a vital component of the local water management system. With its moderate risk assessment score of 3, ongoing risk management measures are in place to safeguard against potential hazards. Climate and water resource enthusiasts can appreciate the role that Coy plays in supporting agriculture and community well-being in this part of Wyoming.
Year Completed |
2009 |
Dam Length |
1500 |
Dam Height |
13 |
River Or Stream |
YELLOW CREEK OFF CHANNEL |
Primary Dam Type |
Earth |
Surface Area |
12 |
Hydraulic Height |
10 |
Drainage Area |
43 |
Nid Storage |
108 |
Structural Height |
13 |
Outlet Gates |
Valve - 2 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
13 |
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.
Coy