Milecastle 73 lies north of the road leading west out of Burgh by Sands
The milecastle was located again in a geophysical survey. It measured 24.75 metres north-south and 26 metres east-west externally. The survey identified a possible road at the milecastle, and two neighbouring enclosures built onto each of the east and west walls of the milecastle, with a further one built to the west of the western enclosure. Some evidence of buildings and divisions were seen in both western enclosures.
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 73 are known as Turret 73A (grid reference NY30505952) and Turret 73B (grid reference NY30025961). 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.
- Historic England, "Milecastle 73 (10726)", PastScape, retrieved 18 December 2013
- Historic England, "Hadrian's Wall between Fulwood House at Burgh by Sands and Burgh Marsh in wall miles 72 and 73 (1014698)", National Heritage List for England, retrieved 18 December 2013
- Historic England, "Turret 73A (10765)", PastScape, retrieved 18 December 2013
- Historic England, "Turret 73B (10766)", PastScape, retrieved 18 December 2013