The 1¼ mile long canal has six locks leading down from Aston Junction. It passes through a grade II listed tunnel at the east of Curzon Street railway station (originally carrying the main lines from it) and under the viaduct of today's eastbound railway line from New Street station. It then originally met the Birmingham and Warwick Junction Canal at the Warwick Bar stop lock just to the rear of Birmingham Proof House, at which there is a short branch to the Typhoo Basin. The junction is called Digbeth Junction or Proof House Junction. It has a total fall of 40 feet.
All of the canal between Ashted Lock at Jennens Road (formerly the A47) and Great Barr Street (Bordesley) is within the Warwick Bar Conservation Area.