Milecastle 55 (Low Wall) was a milecastle on Hadrian’s Wall. The area of ​​the mile fort is on a pasture east of the village of Walton. There are no more remains, only a slight elevation can be seen on a hedge. It measured 22 meters from east to west. Its north-south length is unknown. Remains of the wall (1.4 m high) have also been preserved near the fort.

Hadrian’s Wall in the vicinity of Milecastle 55 survives as a substantial turf covered bank, up to 1.4 metres high, surmounted by a fence and hedge.