Dome Lake No. 1 Reservoir Report

Last Updated: December 5, 2025

Located in Sheridan, Wyoming, Dome Lake No.


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Summary

1 is an earth dam built in 1969 for irrigation purposes along the West Fork Big Goose Creek. The dam is 30 feet in height and stretches 1110 feet in length, with a capacity of 2030 acre-feet of water. Despite its critical role in water resource management, Dome Lake No. 1 has been deemed to have a high hazard potential and poor condition assessment.

The dam features a slide gate outlet and an uncontrolled spillway with a width of 40 feet. The structure is regulated and inspected by the Wyoming State Engineer's Office, with the last inspection conducted in September 2020. Dome Lake No. 1 poses a moderate risk level, prompting the need for ongoing risk management measures and potential emergency action planning to safeguard against any potential failures that could impact the surrounding area.

Climate and water resource enthusiasts will find Dome Lake No. 1 to be a significant piece of infrastructure in the region, playing a crucial role in irrigation and water storage. With its unique design and historical significance dating back to the late 1960s, the dam serves as a reminder of the importance of effective dam maintenance and risk management in ensuring the safety and sustainability of water resources in the area.

Year Completed

1969

Dam Length

1110

Dam Height

30

River Or Stream

WEST FORK BIG GOOSE CREEK

Primary Dam Type

Earth

Surface Area

96

Hydraulic Height

25

Drainage Area

15.2

Nid Storage

2030

Structural Height

30

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

High

Foundations

Soil

Nid Height

30
       
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.