Jerry Johns Reservoir No. 1 Reservoir Report

Last Updated: December 5, 2025

Jerry Johns Reservoir No.


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Summary

1, located in Sheridan, Wyoming, is a privately owned earth dam reservoir primarily used for irrigation purposes. Constructed in 1977 by designer Thomas L. Barker, this reservoir has a maximum storage capacity of 26 acre-feet and covers a surface area of 3 acres. The dam stands at a height of 25 feet with a hydraulic height of 20 feet, serving as a vital water resource for the surrounding area.

Despite its low hazard potential, Jerry Johns Reservoir No. 1 is currently in poor condition, as assessed in August 2021. With a moderate risk level and a five-year inspection frequency, there are concerns about the structural integrity and overall maintenance of the dam. The reservoir's emergency action plan and risk management measures are not clearly outlined, posing potential challenges in the event of a water-related emergency.

Given its importance for irrigation and fire protection, it is crucial for stakeholders to address the maintenance and safety concerns surrounding Jerry Johns Reservoir No. 1. With the potential for increased climate variability and extreme weather events, ensuring the proper upkeep and management of this reservoir is essential for sustainable water resource management in the region.

Year Completed

1977

Dam Length

470

Dam Height

25

River Or Stream

SPRING OR WYMER DRAW

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

20

Nid Storage

26

Structural Height

23

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

25
       
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.