|Distance:||0.6 miles (1 km)|
|Met:||B6136, A1, A645|
|Now part of:||B6136|
|Route outline (key)|
The original route of the B1221 was a short link near Knottingley.
The road started on the A1 on the south side of the Ferry Bridge, which has now been bypassed by the A162. It headed southeast along Fishergate and Ferrybridge Road, ending on the A645 in Knottingley.
The road was soon renumbered as an eastern extension of the B6136, which it remains.