Martin-Thompson Reservoir Report

Last Updated: December 5, 2025

Martin-Thompson is a privately owned dam located in Weston, Wyoming, along the Stockade Beaver Creek.


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Summary

Built in 1939, this earth dam stands at 27 feet high and serves primarily for fire protection, stock, and small fish pond purposes. With a storage capacity of 265 acre-feet, it covers a surface area of 17 acres and has a spillway width of 100 feet.

Despite its age, the dam is in fair condition and poses a low hazard potential according to the latest assessment in 2017. It is inspected every 5 years to ensure its structural integrity and safety. The surrounding area is considered at moderate risk, with no emergency action plan currently in place. Overall, Martin-Thompson remains a crucial infrastructure for water resource management and conservation efforts in the region.

Located in the jurisdiction of the State Engineer's Office in Wyoming, Martin-Thompson plays a vital role in water regulation and inspection within the area. The dam's proximity to Edgemont, SD, and its association with the Omaha District of the US Army Corps of Engineers further highlight its significance in the local water resource and climate landscape. As water resource and climate enthusiasts, it is essential to monitor and support the maintenance of structures like Martin-Thompson to ensure sustainable water management practices for future generations.

Year Completed

1939

Dam Length

400

Dam Height

27

River Or Stream

STOCKADE BEAVER CR

Primary Dam Type

Earth

Surface Area

17

Hydraulic Height

22

Nid Storage

265

Structural Height

27

Outlet Gates

Uncontrolled - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

27
       
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.