The Tame aqueduct links Ashton under Lyne, Lancashire, with Dukinfield, Cheshire. A solid stone aqueduct with 3 arches it crosses the River Tame. Most people think that it's on the Peak Forest canal, but, strictly speaking, it's a branch of the Ashton canal. The Peak Forest starts at Dukinfield Junction, an end on connection immediately on the South side of the structure.
For months now, Keir, contractors for the Canal & River Trust, have been giving it a much needed renovation. The job has gone on longer than expected as it turned out to be in worse shape than anticipated. that's something I'm familiar with on old wooden boats. They're nearly finished now, but I became puzzled as to why they appeared to be attempting to fill the river in. I've now asked some questions and learned the story.
The first part of the job was to erect a lot of scaffolding on both sides and underneath the aqueduct. I did wonder when i saw this going up, what would happen if heavy rain in the hills should cause the river to rise. The scaffolding was pretty much blocking the two side arches, but this is OK because the water runs through the middle one doesn't it? Apparently they were warned that actually it wasn't OK, but professionals know best.
Everything was fine until we had that day of wild weather a few weeks ago, when thw whole country was disrupted by flooding. Every drop of rain that falls in Stalybridge, Mossley, Greenfieldm Saddleworth and all around has to exit via the Tame aqueduct. When there's a lot of rain it brings with it trees and rocks and shopping trolleys by the dozen. The scaffolding acted as a seive, holding back the debris, thus completely blocking the side arches. The middle arch couldn't handle so much water, so it began to back up, thus increasing the pressure on the old stonework. Something had to give and luckily it wasn't the aqueduct, they built 'em well back then, but the river bed. The force of water scoured it out down to the aqueduct foundations.
The aqueduct can't be left with its foundations exposed, so they made a roadway down the steep steps that lead down to the river and have brought in an incredible tracked dumper that can drive up and down this slope to deliver countless tons of rock to restore the river bed.