The remains of Turret 13A (Rudchester East) are covered by the B6318 Military Road.[5] Investigation in 1930 revealed the turret to have the same plan as Turrets 12A and 12B, having a rectangular platform which occupied the south side of the interior. The mortared walls were recorded as 1.22 metres (4.0 ft) thick, with the doorway lying to the east.[3] At the location of Turret 13B, the curtain wall was recorded as 2.82 metres (9.3 ft) thick (broad wall).
The fort of Vindobala (Rudchester) lies between Turrets 13A and 13B.
Location on Ordnance Survey 1:25 000 map: 55.001399°N 1.819958°W