Coyote Den Reservoir Report

Last Updated: December 5, 2025

Coyote Den is a privately-owned irrigation structure located in Sheridan, Wyoming, along Coyote Den Draw.


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Summary

Built in 1965, this earth dam stands at a height of 31 feet and has a storage capacity of 51 acre-feet. With a spillway width of 50 feet and a maximum discharge of 1470 cubic feet per second, the dam serves the dual purpose of irrigation and water supply in the area.

Maintained by the Wyoming State Engineer's Office, Coyote Den has been assessed to have a low hazard potential and fair condition. Despite being classified as a moderate risk structure, it meets regulatory guidelines and undergoes inspections every five years to ensure its continued safety and functionality. With Liz Cheney as the representative for Congressional District 00, Wyoming, the dam is a vital component of the state's water resource infrastructure.

Coyote Den's presence along the UNNAMED ROAD in Sheridan County underscores its importance in water management and agricultural activities. As a key piece of the local water supply system, this structure plays a crucial role in supporting the region's irrigation needs. With its controlled spillway and valve outlet, Coyote Den stands as a testament to effective water resource management in the state of Wyoming.

Year Completed

1965

Dam Length

605

Dam Height

31

River Or Stream

COYOTE DEN DRAW

Primary Dam Type

Earth

Surface Area

4

Hydraulic Height

26

Nid Storage

51

Structural Height

30

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

31
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.