PR 458 begins along the border between the
Municipality of Killarney-Tuttle Mountain and the
Cartwright-Roblin Municipality at a junction with
PTH 3 (
Boundary Commission Trail), with the road continuing south as Road 90W. It heads north along the border to travel through the east side of
Holmfield, where it crosses a bridge over the
Long River, before going through a switchback to fully enter the Cartwright-Roblin Municipality. After joining a short
concurrency with eastbound
PR 253, where the cross the
Pembina River into the
Rural Municipality of Prairie Lakes, the highway heads through a switchback as it passes by the hamlet of
Pleasant Valley before heading north through rural farmland for several kilometres, coming to an end just south of
Belmont at an intersection with
PTH 23, with the road continuing north into town as George Street. With the exclusion of the concurrency with PR 253, which is paved, the entire length of PR 458 is a gravel two-lane highway. ==History==