descends through 46 locks to Ellesmere Port. A stop lock with a minimal drop of just a few inches was built by the Birmingham and Liverpool Junction Canal just before the junction, to ensure that they did not take large volumes of water from the Staffordshire and Worcestershire to supply their canal. It remains in use, although both canals are now managed by the Canal & River Trust and so theft of water is no longer an issue. Bibliography References See also List of canal junctions in Great Britain Canal junctions in England Staffordshire and Worcestershire Canal Transport in Wolverhampton Shropshire Union Canal Stop locks