The highway serves as the main east-west crossing of Grass River Provincial Park and Division No.

PTH 39 now goes through some sharp curves for the next several kilometers, where it has an intersection with PR 596 and begin paralleling the Mitishto River.

The highway now straightens out, crossing the river and coming to an end at an intersection with PTH 6 near Ponton.

A further, more northerly and only partly paved section of Provincial Road 391, doubling back westward from Thompson to Lynn Lake, continues to bear that designation.

Provincial Road 596 (PR 596) is a short 5-kilometre-long (3.1 mi) north-south spur of PTH 39 a few kilometres southeast of Snow Lake, connecting the highway to the Canadian National Railway station at Wekusko.