“Outcrop Tunnel” – New Bridge Lane, Stockport
Alongside the River Goyt to the east of Stockport are a system of tunnels which were constructed between 1743 and 1818 to carry water to power Park Mills, owned by the Marsland Family. These tunnels extended around 700m in length and became known as the Double Ancient Corn Tunnels. Finally used for the supply of cooling water to the Stockport Power Station on Millgate until it closed during the 1980s, today the tunnels exist in a completely flooded state at a depth around 38 feet below the carriageway. Interconnected to the two main water tunnels were a myriad of smaller tunnels, predominantly constructed in the early 1820′s, the 60m long Outcrop Tunnel being just one of them.
Today the Outcrop Tunnel remains relatively in tact due to its inaccessible location, however the western entrance is now completely silted up and blocked.

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