The route heads northeast as a two-lane highway, passing through woodland.

It passes through woodland before coming to a cloverleaf interchange with Route 18.

The road passes through woodland with some farm fields and homes, crossing into Emlenton.

The expressway passes through rural farmland and woodland, with a few houses.

After the concurrency ends, the road passing through woodland, with some houses.

The road passes through mostly woodland, with some farmland and houses.

The route passes through woodland, curving to the west as it follows a winding alignment.

The route heads north as a two-lane highway, passing through woodland and farmland.

At this point, PA 315 becomes four lanes again and passes through woodland.

The road passes through woodland, curving north into Columbia.