The South Portage Road boat ramp provides public access to Lake of Bays and is located at 4066 South Portage Road, west of Dwight in the Township of Lake of Bays, Ontario. It sits on the western portion of the lake near South Portage Park, at approximately 45.

3178°N, 79. 0713°W. Community members note there are two launches in the South Portage Road area, including one on Portage Bay.

The ramp serves anglers and boaters looking to access the southern and central reaches of Lake of Bays, a large, multi-armed lake in the Muskoka region.