The highway travels straight through the center of town along Broadway Street, where it becomes concurrent (overlapped) with PTH 3 (Boundary Commission Trail) and the two head west for a short distance to leave La Rivière.

PR 242 now splits off as a gravel road and climbs its way out of the river valley before zigzagging between some sharp left and right turns for the next several kilometers.

The highway travels along the eastern edge of the town of Treherne, where it becomes paved and has a short concurrency with PTH 2 (Red Coat Trail) before continuing due north through rural areas to cross the Assiniboine River.

After having a short concurrency with PTH 16 (Yellowhead Highway), it bypasses the hamlet of Westbourne along its eastern side before becoming more narrow and winding for the next several kilometers, temporarily entering the Rural Municipality of Portage la Prairie and crossing a small creek.

The highway begins following the coastline of southern Lake Manitoba shortly before coming to a dead end at the Lynchs Point Campground.