Kiewit Herbs Creek No. 1 Reservoir Report

Last Updated: December 5, 2025

Kiewit Herbs Creek No.


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Summary

1, also known as Herb's Creek Dam No. 1, is a privately owned earth dam located in Sheridan, Wyoming. Completed in 1967, this dam serves primarily for irrigation purposes, with a storage capacity of 98 acre-feet. Situated on the Herb Creek, a tributary of Gay Creek, the dam stands at a height of 44 feet and has a length of 425 feet, providing water resources for a drainage area of 3.3 square miles.

With a low hazard potential and fair condition assessment, Kiewit Herbs Creek No. 1 is regulated by the State of Wyoming, with inspections and enforcement carried out by the State Engineer's Office. The dam features an uncontrolled spillway with a width of 50 feet and an outlet gate for water control. Despite its moderate risk assessment, the dam has not undergone any modifications in recent years and has an inspection frequency of 5 years to ensure its continued functionality.

Water resource and climate enthusiasts will appreciate the role of Kiewit Herbs Creek No. 1 in providing water for irrigation, fire protection, and wildlife habitat in the region. Its location in the scenic surroundings of Sheridan, Wyoming, and the moderate risk it poses make it a significant structure for water management and conservation efforts in the area.

Year Completed

1967

Dam Length

425

Dam Height

44

River Or Stream

HERB CREEK, TRIB. OF GAY CREEK

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

40

Drainage Area

3.3

Nid Storage

98

Structural Height

44

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

44
       
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.