Work to repair the 171-year-old railway viaduct will close the M60 for 14 nights in October.
The Highways Agency has been advised by Network Rail that the only safe way to provide worker access to the 111-feet structure will be by using cherry pickers from the carriageway of the M60. The viaduct, just east of Junction 1, Stockport Pyramid, carries the railway line over the M60.
Network Rail's work on the viaduct began on Monday, August 8, but the final phase using overnight access from the M60 – between 11pm and 5am each night – is due to start on Monday, October 3.
The workmen will remove vegetation and repair bricks and drainage on the viaduct. The work requires 14 overnight closures of the clockwise carriageway between Junction 26 at Bredbury and Junction 1, followed by a further 14 nights of closures of the anti-clockwise carriageway between Junction 1 and Junction 25 at Brinnington.
Diversions via the A560 Crookilley Way and Great Portwood Street which run parallel to the motorway, will be in place when one or the other carriageway is closed. The work will be carried out for Network Rail by contractor Birse Rail.
Andy Withington, the Highways Agency's service delivery manager, said: "We have worked with Network Rail to minimise the disruption for road users while the viaduct repairs take place. These M60 closures will enable repairs be undertaken without the need for a permanent scaffold, which would have meant more significant disruption for drivers on the M60.
"Throughout the period of works, traffic officers at our regional control centre at Newton-le-Willows will monitor overnight traffic and set electronic signs across the network to advise drivers of closures and diversions."