The M6 Motorway: Widening between Junctions 20 and 21A (Thelwall Viaduct) and Connecting Roads Scheme 1990

SCHEDULE 3 WITH KEY PLAN AND SITE PLAN PLANS AND SPECIFICATIONS FOR THE VIADUCT CROSSING THE MANCHESTER SHIP CANAL AT THELWALL

Points of Commencement and Termination

From a point south of the centreline of the Manchester Ship Canal in the Borough of Warrington in the County of Cheshire 65 metres north east from the centre of the northern face of the Thelwall Viaduct pier on the southern bank of the canal and 79 metres south east from the centre of the southern face of the Thelwall Viaduct pier on the northern bank of the canal.

To a point north of the centreline of the Manchester Ship Canal 106 metres north east from the centre of the northern face of the Thelwall Viaduct pier on the southern bank of the canal and 53 metres east from the centre of the southern face of the Thelwall Viaduct pier on the northern bank of the canal.

Construction

Composite steel girder and reinforced concrete deck on reinforced concrete piers.

Headroom

22.86 metres minimum headroom above statutory water level above canal fairway tapering to 20.62 metres above statutory water level 5.64 metres from the edge of the fairway.

Diversion of the Canal

This would have the effect of diverting the southern bank of the waterway northwards by a maximum distance of 16 metres and the northern bank of the waterway southwards by a maximum distance of 14 metres. The existing waterway width of 79 metres would be reduced to a minimum width of 48.76 metres.