Wall Mile 68 [HB 347–8]
Crossing Boomby Gill, the Wall is still marked by the by-now familiar hedgerow as it follows the riverside to utilise the cliff on an almost northerly course. As we gradually descend onto the floodplain of the river, the ditch returns and we approach the village of Grinsdale. Arriving at the road we turn right and, some 85m further on, look for the sign on the left that takes us back onto the Trail.
Following the farm track on a north-easterly heading from the village, we note the hedge to our left which is on the line of the curtain wall, and reach the likely site of Milecastle 69 near the crest.
Milecastle 69 (Sourmilk Bridge) [HB 348; haiku]
The site of Milecastle 69 has not been located as yet, despite geophysical surveys in two possible locations (one in 1998 next to the bridge and the other in 2000 at the top of the next rise). A trial trench in 2000 also failed to find it.