Ray Creek Reservoir Report

Last Updated: December 5, 2025

Ray Creek is a privately owned earth dam located in Crook, Wyoming, with a primary purpose of irrigation.


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Summary

Completed in 1914, this structure stands at a height of 20 feet and spans a length of 350 feet. With a storage capacity of 137 acre-feet, Ray Creek serves as a crucial water resource for agricultural activities in the area.

Maintained by the Wyoming State Engineer's Office, the dam has a low hazard potential and is deemed to be in fair condition as of the last inspection in August 2021. Despite its moderate risk assessment rating, the structure meets regulatory guidelines and is equipped with a single valve outlet gate. With a spillway width of 32 feet and uncontrolled spillway type, Ray Creek is designed to manage potential overflow events effectively.

As a vital component of the local water management system, Ray Creek provides valuable irrigation water for the surrounding agricultural lands. Climate and water resource enthusiasts will appreciate the historical significance and operational efficiency of this earth dam, which continues to play a crucial role in sustaining the region's agricultural economy.

Year Completed

1914

Dam Length

350

Dam Height

20

River Or Stream

RAY CREEK

Primary Dam Type

Earth

Surface Area

9

Hydraulic Height

5

Nid Storage

137

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.