Alvingham Lock and Inverted Syphon Tf 365909

Alvingham Lock and inverted syphon, built in 1767 by John Grundy, is a lock structure located on North Cockerington Road in Alvingham. It is constructed of red brick with limestone ashlar dressings, along with wood and cast iron elements. The lock chamber features four concave brick sections on either side, with timber posts that are now partially intact and exposed between them, although some posts are obscured by large ashlar blocks. The tops of these sections are coped with ashlar.

Timber beams remain where the lock gates were originally hung, and some iron fittings are still in place. The end sections of the embankment slope down to curved ends, with the southern sections containing a large basin for barges to moor, although much of this basin has become silted up and also ends in curved embankments. There are two blocked, semi-circular brick drain openings on the west side of the lock chamber. The River Lud, which flows north to south, is culverted and passes under the lock through an inverted syphon. Navigation through the lock was abandoned in 1924.