Quadrant Lake No 1, located in Federal Way, Washington, is a privately owned gravity dam that was completed in 1994 for flood risk reduction purposes. With a structural height of 8 feet and a length of 180 feet, the dam has a maximum storage capacity of 113 acre-feet and a normal storage of 57 acre-feet. It serves a drainage area of 0.73 square miles and can discharge up to 480 cubic feet per second.

Managed by the Washington Dept of Ecology, Quadrant Lake No 1 is state regulated and inspected to ensure its safety and compliance with regulatory standards. With a low hazard potential and a condition assessment of "Not Rated," the dam has not undergone recent inspections or risk assessments. While emergency action plans and inundation maps are not currently prepared, the dam's performance and risk management measures are not detailed in the available data.

Overall, Quadrant Lake No 1 plays a crucial role in flood risk reduction in the area, highlighting the importance of effective management and monitoring of water resources to mitigate potential hazards and ensure public safety. For water resource and climate enthusiasts, this dam serves as a fascinating case study in dam engineering and regulatory oversight in the state of Washington.