Thompson Srd Reservoir Report

Last Updated: December 5, 2025

Thompson Srd, also known as the Seepage Return Dam, is a privately owned structure located in Clayton, Idaho.


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Summary

Built in 1982, this earth dam serves the primary purpose of water supply, with a storage capacity of 75 acre-feet and a drainage area of 3.5 square miles. The dam stands at a height of 76.6 feet, with a hydraulic height of 72 feet, and a length of 360 feet. It is situated on the Bruno Creek and Squaw Creek, within Custer County, Idaho.

Managed by the Idaho Department of Water Resources, Thompson Srd is regulated, inspected, and enforced at the state level to ensure its safety and functionality. The dam features an uncontrolled spillway with a width of 7 feet and slide gates for outlet control. Despite being classified as having a significant hazard potential, the dam's condition assessment in 2018 deemed it to be satisfactory. With a moderate risk rating, measures for risk management and emergency preparedness are yet to be fully detailed for this key water resource infrastructure.

Water resource and climate enthusiasts will find Thompson Srd to be a vital component of the regional water supply infrastructure in Idaho. Its strategic location, storage capacity, and state-regulated management make it a crucial asset for water management in the area. As efforts continue to monitor and maintain the dam's safety and functionality, its role in supporting water needs in Clayton and surrounding areas remains essential for sustainable water resource management in the region.

Year Completed

1982

Dam Length

360

Dam Height

76.6

River Or Stream

BRUNO CREEK SQUAW CREEK

Surface Area

5

Hydraulic Height

72

Drainage Area

3.5

Nid Storage

75

Outlet Gates

Slide (sluice gate)

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

77
       
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.