Robber's Roost Reservoir Report

Last Updated: December 7, 2025

Robber's Roost is a privately owned irrigation dam located in Weston, Wyoming, along the Robbers Roost Creek.


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Summary

Built in 1955, this earth dam stands at a height of 22 feet and has a hydraulic height of 17 feet, with a length of 2080 feet. The dam serves the primary purpose of irrigation and has a normal storage capacity of 1250 acre-feet, with a maximum storage capacity of 1989 acre-feet.

Despite being classified as having a low hazard potential, Robber's Roost has a fair condition assessment as of its last inspection in May 2017. The spillway of the dam is uncontrolled with a width of 175 feet, and it is equipped with two valve outlet gates. The risk assessment for this dam is moderate, indicating potential vulnerabilities that may need to be addressed in the future. Overall, Robber's Roost serves as an essential water resource infrastructure in the area, providing crucial irrigation capabilities for the surrounding agricultural lands.

Year Completed

1955

Dam Length

2080

Dam Height

22

River Or Stream

ROBBERS ROOST CREEK

Primary Dam Type

Earth

Surface Area

183

Hydraulic Height

17

Nid Storage

1989

Structural Height

22

Outlet Gates

Valve - 2

Hazard Potential

Low

Foundations

Soil

Nid Height

22
       
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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.