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