Pontoon Slough Boat Ramp, located on the south side of Highway 25 near Nelson, Wisconsin, provides access to the Nelson-Trevino Bottoms Canoe Trail, an official USFWS designated national paddling trail.

This landing serves as a key access point for kayakers and canoeists exploring the Upper Mississippi River backwaters, with paddling routes suitable for beginning paddlers.

The City of Alma charges a daily pass fee ($5 for boats, $2 for kayaks) to support maintenance of its boat landings.