The navigation turns to the west, passing under the railway line, and then loops back to return to the eastern side of the railway. It runs along the northern edge of some railway sidings which form part of Eastleigh Works, to reach Withymead Lock. This was unusual, as it included a bypass channel to take excess water around the lock, whereas the other locks used vents in the gates. Just below the lock, the navigation rejoins the river channel. At Barton Bay, the Barton River leaves the navigation, following a course to the west of the channel. A horse bridge carried the towpath over the river, which used to supply water to Barton Peveril Mill. The next cut began a little further south, with Bishopstoke or Stoke Lock at the head of it. There are four bridges on Bishopstoke Road, as it crosses the Barton River, the navigation, the river channel and the tailrace of Shears Mill, Bishopstoke. The mill was a large four-storey building, which was demolished in the 1920s. Four years before demolition, two water turbines of and diameter were installed, and were retained after the demise of the mill, in the hope that they could be used to generate DC power for the village. Several community groups were looking at the possibility of restoring the water turbines to generate electricity.