Trego Lake is a 383-acre flowage created by the Trego Hydro Dam on the Namekagon River in central Washburn County, Wisconsin, located just north of Spooner at the intersection of Highway 53 and 63. Designated as "outstanding resource water" by the Wisconsin Department of Natural Resources, this impoundment stretches approximately five miles from Highway 53 to the dam with a maximum depth of 36 feet and an average depth of 11 feet. While officially called a lake, Trego Lake functions more as a flowage with riverine characteristics than traditional lake features. The waterbody is part of the St. Croix National Wild and Scenic Riverway system, with Potato Creek entering from the south. The system is considered wild rice waters and serves as a Priority Navigable Waterway for muskellunge in its upstream sections.