Highway 529A is a short route with travels between Bayfield Inlet and Highway 529 at Manbert. The route begins at the entrance to Bayfield Lodge in the middle of Bayfield Inlet. It travels east along the north shore of the inlet before penetrating briefly into the forest, then emerging into a grassy knoll. Shortly thereafter it enters a shrubby grassland and zig-zags northeast and southeast, eventually transitioning into a thick forest. Occasionally, large granite outcroppings of the Canadian Shield create breaks in the growth. The route is 4.5 kilometres (2.8 mi) in length and features a narrow cross-section. On an average day, only 160 vehicles travel the highway.
Highway 529A was the original route of Highway 529, which was designated in 1956. At that time, the present-day route of Highway 529 was the alignment of Highway 69. When Highway 69 was realigned through the area in 1960, Highway 529 was designated along the former route and the "A" suffix designated. The route has remained unchanged since then.
^Ontario Department of Highways (1956). Ontario Road Map (Map). Cartography by C.P. Robins. Section O32.
^"Ontario Secondary Roads Now Designated 500, 600" 112 (33,119). The Globe and Mail. February 4, 1956. p. 4. "Two new Ontario road numbers appear on the province's 1956 official road map which will be ready for distribution next week. The new numbers are the 500 and 600 series and designate hundreds of miles of secondary roads which are wholly maintained by the Highways Department. More than 100 secondary roads will have their own numbers and signs this year. All of these secondary roads were taken into the province's main highways system because they form important connecting links with the King's Highways"