The B6258 follows the original route of the A6 through the Central Lancashire village of Bamber Bridge.
The road starts at a mini-roundabout on the [[A675] in Walton-le-Dale and heads south along Chorley Road. Initially for historical reasons the road is the dominant number in a useless multiplex with the B6230; after we cross the River Darwen a mini-roundabout is reached where that road turns off to the right. We continue on into Bamber Bridge, crossing a few more mini-roundabouts.
We follow Station Road, the main street, and soon cross a level crossing over the East Lancashire Line; the station is just to the right. Shortly afterwards we cross the line of the Lancashire Canal Tramway, whose route can be assumed from the air but is not visible on the ground. A green is then reached. Church Road, to the left, is the original A6; the junction later became a roundabout which is still visible if you know what to look for. However, construction of the present southern bypass altered all this and so the B6258 continues ahead along what was the northern end of the A49 to meet both roads just round the corner at traffic lights.