Located in Redmond, Washington, Radar Lake Dam, also known as Obrian, serves as a private recreational water resource on Tr-Bear Creek. Completed in 1973, this earth dam stands at a hydraulic height of 34 feet, with a structural height of 14 feet and a length of 2500 feet. Its primary purpose is for recreational use, providing a surface area of 44 acres and a maximum storage capacity of 90 acre-feet.

Managed by the Washington Department of Ecology, Radar Lake Dam is state-regulated, inspected, and enforced to ensure its safety and functionality. With a satisfactory condition assessment and a high hazard potential, the dam poses a potential risk that requires regular monitoring and maintenance. Despite its potential hazards, the dam's emergency action plan and risk management measures are currently not specified, highlighting the need for comprehensive preparedness and mitigation strategies.

Congressional District 01's representative, Suzan K. DelBene, oversees Radar Lake Dam, emphasizing the importance of water resource management and climate adaptation in the region. As a pivotal structure in King County, Washington, this dam plays a significant role in providing recreational opportunities while also warranting careful attention to its regulatory compliance and risk management for the safety of the surrounding community and environment.