Chalk Farm Lane Bridge
The original bridge, carrying Chalk Farm Lane over the London and Birmingham Railway, was constructed of bricks.
It was replaced by a wrought iron box girder bridge constructed by H. and M. D. Grissell in 1846-7, 'erected to Mr. Robert Stephenson's new plan'.[1]. The bridge was designed by Robert Benson Dockray[2]. The top chord was made of cast iron, to which the wrought iron side plates were riveted.
The iron bridge was replaced by the present steel structure in the early 20thC.
Note: A bridge called Chalk Farm Bridge was constructed in 1876-7 to replace one built over the Regent's (Grand Union) Canal (Bridge No. 24) in 1815, at the junction of Chalk Farm Road and High Street. That was a skew bridge with a shallow arch constructed from brick and stone with iron clamps. The replacement bridge has five wrought iron girders, two of which were made gas tight. [3]