View towards the Solway Firth near the site of Milecastle 77
Milecastle 77 is thought to lie northeast of the village of Glasson. The exact location has not been found. The area was excavated in 1973, but the results were inconclusive. It is thought to be situated about 50 metres south of the junction of the Glasson road with the Bowness-Carlisle road.
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 77 are known as Turret 77A (grid reference ) and Turret 77B (grid reference ). The exact locations of the turrets have not been found.
- Historic England, "Milecastle 77 (10077)", PastScape, retrieved 19 December 2013
- Historic England, "Drumburgh Roman fort and Hadrian's Wall between Burgh Marsh and Westfield House in wall miles 76 and 77 (1014699)", National Heritage List for England, retrieved 19 December 2013
- Historic England, "Hadrian's Wall vallum between the watercourse 400m south east of Glasson and the access road to Glendale caravan park in wall miles 76 and 77 (1014700)", National Heritage List for England, retrieved 19 December 2013