The Ashton Canal runs from the Rochdale Canal at Ducie Street in Manchester to its junction with the Huddersfield Narrow Canal at Ashton under Lyne, 0.4 miles (0.6 km) east of Dukinfield Junction, where the Ashton Canal is joined by the Peak Forest Canal. The Ashton Canal is 6.7 miles (10.8km) long and has 18 locks. The canal has two disused branches (both partly filled in, but proposed for restoration): the Hollinwood Branch - 4.6 miles (7.2km) and 7 locks (which joined at Fairfield Junction), and the Stockport Branch - 4.9 miles (7.8 km) and no locks (which joined at Clayton Junction, in the middle of the Clayton Lock flight).
The maximum boat length that can navigate the Ashton Canal is
length: 74' 0" (22.5 metres) - Lock 2
beam: 7' 3" (2.2 metres) - Lock 4
height: 6' 5" (1.95 metres) - Bridge 21 (Lumb Lane)
draught: 3' 7" (1.1 metres) - cill of Lock 9