 There are several notable features along the canal , including Prestolee Aqueduct and Clifton Aqueduct , both of which are Grade II listed structures . Nob End Locks ( sometimes referred to as Prestolee Locks ) sit at the junction of the three arms of the canal at Nob End . They comprise two sets of three staircase locks , separated by a passing basin . These locks served to lower the level of the canal by 64 feet ( 20 m ) over a distance of 600 feet ( 183 m ) . The upper staircase is still visible , but most of the lower staircase was filled in at some point in the 1950s , and much of the stonework was removed . 
