4 Mile

Located in Janesville right on the Rock River, this public boat ramp is managed by the Wisconsin Department of Natural Resources and offers solid access for a day on the water. Whether you're planning to fish, paddle, or just enjoy some time on the river, you'll find this a convenient launch point in Rock County. The public access makes it a reliable option for local boaters, and it's worth checking conditions before you head out, especially during seasonal water level changes. Stop by and see what the Rock River has to offer.