The Rat Tunnel - Bollington
Came across this some time ago, when walking past with the doggo i noticed the inviting culvert entrance and pinned it on my maps for a future visit. Maps doesn't give anything away really with this one and it's one you’d only know about if you were local. The culvert bends round to the left for a few hundred yards with a sewer line present throughout. Further upstream are a couple of shorter culverts and some bridges before you reach a former mill. A great example of Victorian era engineering that is still working and in use today without us necessarily realizing so.
History
A tributary of the River Dean Bollington, Harrop brook follows downstream from a reservoir weir through the local park known locally as 'the rec' through to the 'rat tunnel' culvert passing through a number of small bridges and culverts.