Milecastle 74 is thought to lie near the road leading from Burgh by Sands to Drumburgh. The milecastle has never been found, and its position has been estimated in reference to neighbouring wall structures. The site falls within Burgh Marsh where there are no known remains of Hadrian's Wall.
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 74 are known as Turret 74A (grid referenceNY29015972) and Turret 74B (grid referenceNY28545974). The exact locations of the turrets have not been found. Both sites fall within Burgh Marsh where there is no evidence for any Wall structures.