Milecastle 49

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Milecastle 49 (Harrow's Scar), one of the milecastles on Hadrian's Wall, is situated immediately west of the gorge of the river Irthing (OS grid reference NY 620 664), where the Wall was carried over the river by the bridge at Willowford.

It measures 19.8m east to west by 22.9m north and no contemporary internal buildings are now visible. It is built with narrow gauge defensive walls which are bonded with the Narrow Wall curtain of Hadrian's Wall on either side. It has Type III gateways. It lies 1458m west of Milecastle 48 and 1391m east of Milecastle 50.

Parts of the underlying Turf Wall milecastle (49TW) were identified by Richmond.

It was excavated in 1898 and by I.A. Richmond in 1953.

The monument is currently in the care of English Heritage.