Trego Lake is a 383-acre impoundment of the Namekagon River in Washburn County, Wisconsin, reaching depths of up to 36 feet. The lake is formed by the Trego Dam and serves as part of the St. Croix National Scenic Riverway system.

Primary access is available via a public boat landing, with additional access points at Trego Town Park and near the Namekagon River Visitor Center. Paddlers should note that a required portage exists at Trego Dam on river-right. The lake experiences regular motorized boat traffic, particularly during summer weekends, creating wake conditions paddlers must manage.

The lake's cold, clear waters support diverse fishing opportunities, including musky, walleye, northern pike, largemouth and smallmouth bass, and panfish. Wild rice grows in some shallow areas, particularly in the first mile of the lake where it begins to widen from the river. After this section, the lake narrows into a more intimate passage with residential properties along the shoreline.

Trego Town Park offers amenities including water, restrooms, and a 50-site campground with electrical hookups. Several outfitters in the area provide kayak and canoe rentals, including Jack's Canoe Rental and Log Cabin Resort, both offering shuttle services.

The lake is part of a popular paddling route along the Namekagon River. The section through Trego Lake spans approximately 5 miles from the Highway 53 bridges to the dam. The upper portion of the lake tends to be shallower with observable current, while the main body of the lake requires more dedicated paddling effort due to decreased current and potential headwinds.

For those continuing downstream on the Namekagon River, the County K Landing is located a short distance below the dam. The National Park Service maintains the Trego Nature Trail along the north shore, though water access to the trail is limited.