Bridge 146 and Brynderwen Lock

Single span brick arched bridge with lock continuing to the S from the abutments. The bridge has a brick string course and concrete deck. The N parapet is of red brick with sandstone coping; the S parapet is of blue brick with concrete coping. The parapets continue as curved returns terminating in piers, except to the NE. Straight brick abutments. Splayed blue brick walls continue at a low level from the N end of the abutments and contain slots for stop planks. The blue brick-lined lock chamber with sandstone copings continues towards the S. There are recesses for timber swing gates and stop gates with cast iron-lined rebates. The remains of a cast iron rack and pinion-operated gearing mechanism can be seen at the south end. Below this, a cast-iron lined culvert runs away from the canal on both sides. The overflow culvert is on the W side of the lock and its face has been repaired in timber. A simple timber access way has been constructed over the lock to the S of the S parapet.