In 1958, construction began to connect the route with Highway 17 near Ignace, working south from Savant Lake. By 1963, Highway 599 was opened to the community of Valora, where it connected with the Ignace–Valora Road. On February 15, the province signed an "industrial road agreement", which opened the Ignace–Valora Road to the general public, connecting Highway 599 with the rest of the province.
