Thompson, also known as Mcgee Lake, is a privately owned dam located in Los Angeles, California, near the Pacific Ocean. Built in 1925, this Earth-type dam stands at a height of 114 feet and has a storage capacity of 1,010 acre-feet. It serves as a vital water supply source, with a primary purpose of water supply and a drainage area of 8.6 square miles.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Thompson Dam is subject to state regulation, inspection, and enforcement to ensure its safe operation. Despite being classified as having a high hazard potential, the dam's condition was assessed as satisfactory during the last inspection in 2017. With a spillway type unspecified, the dam's design and construction play a crucial role in mitigating potential risks associated with its operation.

Thompson Dam plays a significant role in water resource management and climate resilience in the region. Its proximity to the Pacific Ocean and strategic location along the Middle Canyon River makes it a critical infrastructure for water storage and supply. As water resource and climate enthusiasts, understanding the regulatory framework, design specifications, and maintenance protocols of dams like Thompson is essential for ensuring the safety and sustainability of our water infrastructure in the face of changing environmental conditions.