Trout Lake is only 15 km north of Sault Ste Marie and there is a small public beach suitable for launching a kayak. The lake is not overly populated with cottages/homes and makes for a nice after-work paddle. I paddled the perimeter of the lake in approx. 2 hours.
Make a right hand turn off of Highway 17 onto Trout Lake Rd. Just prior to reaching a sign that says, "Trout Lake Association Private Road" there will be a small public access on your left: