A quick visit to the Grand Union Canal between Harefield and Denham, at the point where the Colne Valley Viaduct, part of the HS2 railway, crosses it.
The construction of the two-mile-long viaduct has been creeping towards the canal for the last two years, and new the red construction girder has slid across the canal itself, and is installing the concrete segments of the permanent structure below.
The construction means that the east bank (which is part of the London LOOP walk) is closed for a couple of weeks, while the towpath on the west bank has now reopened, but closes for 20-30 minutes several times a day for each concrete segment to pass over. The canal itself has been closed all winter to boaters but is tentatively going to start opening from tomorrow, daytime only.
