Wesley Reservoir Report

Last Updated: December 5, 2025

Located in Monarch, Wyoming, Wesley is a privately owned earth dam that was completed in 1915 for the primary purpose of irrigation.


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Summary

This structure spans 468 feet in length, with a height of 20 feet and a storage capacity of 112 acre-feet. Situated on the South Fork Early Creek, Wesley is regulated and inspected by the Wyoming State Engineer's Office, ensuring its safety and compliance with state regulations.

Despite its historical significance, Wesley is currently assessed to be in poor condition, with a low hazard potential. The dam features an uncontrolled spillway and one outlet gate, with a spillway width of 40 feet. Although the risk assessment indicates a moderate level of risk, the structure has not been modified in recent years. With a drainage area of zero and a surface area of 8 acres, Wesley serves as a crucial water resource for irrigation in the region.

As a vital component of the local water management infrastructure, Wesley presents both historical value and practical utility. With its unique design and purpose, the dam continues to play a key role in supporting agricultural activities in Sheridan County, Wyoming. Enthusiasts and stakeholders in water resources and climate resilience can appreciate Wesley's significance in sustaining the region's agricultural economy while also recognizing the need for ongoing maintenance and monitoring to ensure its continued safety and effectiveness.

Year Completed

1915

Dam Length

468

Dam Height

20

River Or Stream

SOUTH FK EARLY CREEK

Primary Dam Type

Earth

Surface Area

8

Hydraulic Height

15

Nid Storage

112

Structural Height

20

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

20
       
Seasonal Comparison

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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.