Each milecastle on Hadrian's Wall had two associated turret structures. These turrets were positioned approximately one-third and two-thirds of a Roman mile to the west of the Milecastle, and would probably have been manned by part of the milecastle's garrison. The turrets associated with Milecastle 70 are known as Turret 70A (grid reference NY34805929) and Turret 70B (grid reference NY34255930). None of the turrets between Milecastles 59 and 72 were sought or identified prior to 1961, and the exact locations of turrets 70A and 70B are uncertain.