The Thelwall Viaduct is a steel composite girder viaduct in Lymm, Warrington, England. It carries the M6 motorway across the Manchester Ship Canal and the River Mersey. It is between junctions 20 and 21 of the M6, the former being also known as junction 9 of the M56.
It comprises two separate bridges, one of 4,414 feet long carrying the northbound carriageway, the longest motorway bridge in England when it was opened in July 1963, and one 4,500 feet long carrying the southbound carriageway, opened in 1995. The longest single span is that of 336 feet crossing the Ship Canal.
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Address: Warrington, United Kingdom
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