Wow that's fabulous, it has also caused me to procrastinate terribly as I tried to find out the location of the viaduct. What I think I have deduced is this viaduct is today called "
The Congleton Viaduct", and can be seen here in
Street View. In the article it states "
The Congleton Viaduct, though consisting of only ten arches, is scarcely inferior to that over the Dane in grandeur of appearance" is fact referring to the "
Dane In Shaw Viaduct" also located at Congleton, opened in
1848, a year earlier. Likely a great example of a name moving to the new and better version of the same thing.
In the full illustration that can be seen in link
@rob1693 posted, behind the viaduct you can see the hill called "The Cloud" or "Bosley Cloud". Another
painting of the area from the same period, and a
more recent photo show the area where the fete was being held.
I think your paper and image are better at showing the detail of the print than the internet archive. I love the toffs off to the right side in top hats and hoop/cage dresses, compared to the workers sat on the benches 'under control' even though the event is "To The Workmen of Great Britain".
Fitz