Waughop Lake is a lake less than 1.6 km (1.0 mi) east of Steilacoom in Pierce County, Washington, United States. The lake lies within Fort Steilacoom Park, in the city of Lakewood, Washington. Waughop Lake has a surface area of approximately 33 acres (130,000 m2) and a mean depth of 7 feet (2.1 m). The lake is fed by groundwater and has no surface drainage channels.
The lake is named after Dr. John Wesley Waughop, former superintendent of the Washington State Hospital for the Insane. The hospital, now known as Western State Hospital, lies across from the park on Steilacoom Boulevard SW. The lake is circled by a 9/10 mile paved loop trail.