Myrtle Reservoir Report

Last Updated: December 8, 2025

Myrtle, a private water resource located in Campbell, Wyoming, serves multiple purposes including fire protection, stock, and small fish pond.


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Summary

Built in 1963, this earth dam stands at 29 feet high with a hydraulic height of 24 feet, providing a storage capacity of 132 acre-feet. Situated along the Wild Horse Creek, Myrtle covers a surface area of 10 acres and spans 562 feet in length.

Despite its low hazard potential and fair condition assessment, Myrtle is subject to regular inspections every 5 years to ensure its structural integrity. The dam features an uncontrolled spillway with a width of 100 feet and no outlet gates. In case of emergencies, the dam's Emergency Action Plan (EAP) status is currently unknown, highlighting the importance of updated safety protocols for this vital water resource.

With a moderate risk assessment rating and located within Congressional District 00 of Wyoming, Myrtle represents a significant asset for water management in the region. As water resource and climate enthusiasts, staying informed about the latest updates and maintenance efforts for dams like Myrtle is crucial to ensuring their continued functionality and safety for both local communities and the environment.

Year Completed

1963

Dam Length

562

Dam Height

29

River Or Stream

WILD HORSE CREEK

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

24

Nid Storage

132

Structural Height

29

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

29
       
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.