Lake Wilhelm is a 1,680-acre lake located in Maurice K. Goddard State Park in western Pennsylvania. The lake allows motorboats up to 20 horsepower, with a 241-slip marina and multiple boat launches available. Four launches are within the state park, while three are in adjacent state game lands. Kayak/canoe storage racks can be reserved at Launches #3 and #4.

The lake is divided into two sections by Interstate 79. The 240-acre northwestern portion is managed as State Game Lands 270, permitting only electric-powered and non-powered vessels. The remaining 1,440 acres are managed by the state park.

Paddlers can enjoy diverse wildlife, including bald eagles, osprey, and various waterfowl. The surrounding landscape features wetlands, old fields, and mature forests. The lake's maximum depth is 24 feet at the dam, with an average depth of 12 feet.

A 12-mile paved trail follows the shoreline, offering opportunities to combine paddling with hiking or biking. Boat rentals, including canoes and kayaks, are available from May 1 through Labor Day. The boat concession also sells basic supplies and offers food services.

Ice boating is permitted when conditions allow, though ice thickness is not monitored. Paddlers should be aware that the extreme northern end above the highway bridge is off-limits as a fish and game sanctuary.

Lake Wilhelm offers good fishing opportunities for species like largemouth bass, walleye, and northern pike. The lake's relatively shallow depth and surrounding wetlands contribute to its productivity for both fish and birdlife.