When building of the Birmingham Canal main line continued towards Wolverhampton and the Staffordshire and Worcestershire Canal at Aldersley Junction, Spon Lane Junction was formed half way down the Spon Lane flight of locks, at the Wolverhampton Level of 473 feet (144 m).

The first was a new cut 12 feet (3.7 m) lower than the original summit, which eliminated two locks at either end, and was completed on 2 July 1789.

A second new cut was then made 6 feet (1.8 m) below this, to eliminate the third lock at each end, and the spoil was removed using the middle line.

The canal had to be closed for 22 days to allow the ends of the new cut to be connected to the original channels, and for it to fill with water, but the new line was operational on 6 April 1790.

[3] Traffic on the system continued to expand, and in 1825 the engineer Thomas Telford was asked to construct a new main line.

[5][6] When the top three locks of the Spon Lane flight were no longer required, as a result of the lowering of the summit, they were simply filled with earth and abandoned.

The two skew arches are elliptical in shape, and it is built in brick with sandstone dressings and cast iron railings.