- Thelwall Viaduct
Manchester Ship Canal
Thelwall, a district of Warrington, England
The Thelwall Viaduct (gbmapping|SJ664883) is a steel composite girder
viaductin Thelwall, a district of Warrington, England. It carries the M6 motorwayacross the Manchester Ship Canaland the River Mersey. Its location on the motorway network is between junctions 20 and 21 of the M6, the former being also known as junction 9 of the M56.
It actually comprises two entirely separate
bridges, one carrying the northbound carriageway (opened in July 1963) and one the southbound carriageway (opened in 1995). Both viaducts are approximately 1.35 km long, with the longest span being 102.4 m over the Ship Canal. [http://homepages.tesco.net/frankshackleton/mscbridges/section7/section7.htm Bridges of the Manchester Ship Canal] , accessed on 5 June 2007]
The Thelwall Viaduct became notorious in July
2002, when a failed roller bearingwas discovered and it became necessary to close all but one northbound lane. As the M6 at the time carried an estimated 150,000-160,000 vehicles per day, this led to serious congestion. [UK Parliament|date=14 April 2003|place=Written Answers|speaker= David Jamieson|column=600W|url=http://www.theyworkforyou.com/wrans/?id=2003-04-14.108894.h|title=Transport - Thelwall Viaduct] The viaduct was not completely reopened to daytime traffic until February 2005, and subsequently remained partially closed at night for further remedial work to take place. [cite web|url = http://news.bbc.co.uk/1/hi/england/manchester/4242437.stm|title = BBC News: M6 viaduct reopen after repairs] In all, 148 bearings were replaced, with the repair scheme costing £52 million.
* [http://www.iht.org/motorway/m6prewar.htm The Motorway Archive website]
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