The motocyclist who is in his 40's is being treated for leg injuries.
The M6 Northbound is blocked from J24 A58 Liverpool Road (Ashton In Makerfield) to J25 (Bryn).
Congestion to beyond J23 (Haydock).
Traffic is also slowing to look on the opposite side.
It's understood a motorcyclist has come off their bike.