Tunnel Bridge

Tunnel Bridge is a large single-span bridge made of coursed stone, featuring a wide segmental arch constructed from stone voussoirs with a dripmould, which springs from ground level. The bridge has a string course along the parapets, which are topped with flat stone copings, although some sections have been replaced with concrete. The deck is wide, very slightly humped, and is now covered in grass. The ends of the bridge are splayed, with quadrant walls and end piers, and the parapets run continuously along the sides.

To the east of the bridge, there is an older wall made of large blocks of random stone, which has been truncated at the current deck level. At the base of this wall, there is a low segmental arch of stone voussoirs that is slightly inset, which carries a mill-race in the form of an earthwork, originating from a small weir on the southeast side of the bridge and extending northward for some distance. Further to the east and slightly set back on the north face, there is a short section of masonry that contains the entrance to a narrow tunnel, which allows a footpath to pass under the bridge. This tunnel features an elliptical-arched brick vault supported by stone side walls. To the south, there is a projection with stone side walls that curves slightly towards the southwest.