Tunnels, Bridges, Lifts and Inclines

I’d love to spend a few weeks on a narrowboat traveling through the canals and inland waterways of Great Britain. The nation offers literally thousands of miles of publicly-accessible routes with much of it interconnected into a single system, allowing one to experience the countryside at four miles per hour.

This article isn’t so much about the canal network itself. Other websites such as Scottish Canals and the Inland Waterways Association already provide all the information one might need. Rather, this is about some of the unusual engineering features found along these waterways.

While I’m sure I’d be completely content as I puttered through the British countryside, I’d certainly point a course towards the extremes and the oddities. Water doesn’t necessarily flow where man may want it to go. People need to channel, corral and coax it to form a suitable transportation network. Engineers and designers came up with some rather ingenious solutions from the late 18th Century through the middle of the 19th Century in those early years of the industrial revolution.


Tunnels

Does a hillside block the intended watercourse? No problem. Dig a tunnel.

I had a difficult time finding a visible canal tunnel entrance from the images available on Google Street View. In general, tunnels bore into the surrounding landscape so they sink below eye level. They tend to have rights-of-way on either side that becomes naturally protected spaces for trees and other vegetation. It’s easy to spot a canal running through the countryside by searching for a tell-tale line of trees. However it’s difficult to find a clear shot of a canal as it enters a tunnel using Street View.

The Dudley Canal in West Midlands transported limestone in the last century. Here, the Dudley Tunnel begins its underground journey. This entrance happens to be located right by the Dudley Canal Trust which offers underground boat trips into the tunnels and over to the limestone caverns.


Bridges (Aqueducts)

Imagine the importance of these inland waterways of the 19th Century especially in the days before the ubiquitous railroad. Certainly greater tonnage could be floated through the countryside than pulled by horse or oxen across abysmally rutted roads and muddy paths. Notice that canals resembled modern road networks. Naturally they served a similar purpose during their prominence.

Obstacles in the way? Bridges are handy.

Tividale Aqueduct

Construction engineers could design bridges — or aqueducts — at the intersection of canals where elevations differed. I found this example not far from Dudley as I searched for canal tunnels. I couldn’t get a clear image of the tunnel but I did find this nice bridge. Here the Netherton Tunnel Branch Canal passes beneath the Old Birmingham Canal Navigations (BCN) Main Line at Tividale Aqueduct.

Pontcysyllte Aqueduct

Exceptional aqueducts existed at valley crossings. Designers sometimes chose to cut a path directly above the valley rather than step a canal down to the valley floor and then step it back up with a system of locks. An aqueduct is more difficult from an engineering standpoint but transportation time savings are considerable.

Pontcysyllte Aqueduct (Untitled). Photo by steve p2008; (CC BY 2.0)

Pontcysyllte Aqueduct in Wales is particularly dramatic, carrying the Llangollen Canal over a valley formed by the River Dee. This cast iron structure spans nearly a quarter of a mile while carrying boats 125 feet above the valley floor. Google Street View captured this well. The though of carrying what is essentially a river across this gap is truly remarkable. Perhaps that is why this 1805 achievement is a UNESCO World Heritage Site:

“Situated in north-eastern Wales, the 18 kilometre long Pontcysyllte Aqueduct and Canal is a feat of civil engineering of the Industrial Revolution, completed in the early years of the 19th century. Covering a difficult geographical setting, the building of the canal required substantial, bold civil engineering solutions, especially as it was built without using locks.”


Lifts and Wheels

I have nothing against canal locks. I rather enjoy them as a matter of fact, both modern and antique. However they’re simply too common. Tunnels and Aqueducts are great too. But let’s find some even more unusual structures that exist on the inland waterways of Great Britain.

Don’t have enough room for a lock? Build a lift!

Anderton Boat Lift

Anderton Boat Lift (100_2632). Photo by deadmanjones; (CC BY-NC 2.0)

I couldn’t find a decent angle on the maps websites so I’ve borrowed an image from Flickr. This shows the Anderton Boat Lift in Cheshire (see map). A boat enters the lift. Counterweights composed of water-filled caissons move vessels between the River Weaver (up) and the Trent & Mersey Canal (down). The elevation difference between the two waterways is about fifty feet.

Falkirk Wheel

Only one other working boat lift exists in Britain and it’s of recent vintage: the Falkirk Wheel in Scotland (map).

I’d love to visit someday but I’ll have to satisfy my curiosity with YouTube for now. It’s also a lot easier to let the video demonstrate how this thing works instead of trying to explain it. The Falkirk Wheel is a rotating lift rather than an elevator-style lift. It connects the Forth and Clyde Canal with the Union Canal, replacing eleven traditional locks over a nearly eighty foot elevation difference.

The Falkirk Wheel arrived more than a century after the heyday of industrial revolution canal building. It opened in 2002. This recent vintage seems somewhat mystifying since many other options are available for cargo transport. It seems to exist primarily for tourism and recreation.


Inclined Planes

Are other options available? Why yes, there’s always the inclined plane.

Great Britain no longer has any functioning inclined planes along its inland waterways as far as I could ascertain. However I found evidence of one that existed in the early 20th Century at the Foxton Locks. These operated in Leicestershire along the Grand Union Canal. The satellite image shows the ruins of the old inclined plane with functional locks on the left.

It’s an odd concept about halfway between a lift and a lock, with characteristics of both. Like a lock, it conforms to the contours of the landscape. Like a lift, it uses counterbalances to create a single continuous motion. Wikipedia has a nice photograph of an inclined plane in action on the Marne-Rhine Canal in northeastern France. It looks really strange.

The inclined plane at Foxton Locks reduced travel time from 75 minutes to 12 minutes but there wasn’t sufficient barge traffic to make it economically viable. Restoration, however, is underway with the increased interest in recreational canal boating. Britain may have an inclined plane once again.

Are any of the readers of Twelve Mile Circle familiar with these or similar structures? Please share your findings in the comments.

Comments

10 responses to “Tunnels, Bridges, Lifts and Inclines”

  1. Alan Twelve Avatar
    Alan Twelve

    My first thought reading this was of the Falkirk Wheel, but you got there ahead of me…

    So, have a tunnel instead. The Regents Canal in north London passes under Islington and the western end of the tunnel is clearly visible in Streetview from Caledonian Road.

    http://bit.ly/eOQnix



    Unfortunately, the eastern end of the tunnel is pretty much obscured by trees, but is just about visible here:

    http://bit.ly/i8hPUY

    There’s a nice webpage about the Islington Tunnel (and London’s other two canal tunnels) here:

    http://www.londoncanals.co.uk/ltnl/ltnl01.html

    One little point of trivia. If anyone’s read the Iain Banks novel Walking On Glass, the final scene of the book, by the canal, is set at the western end of the Islington Tunnel.

  2. Alger Avatar
    Alger

    In the US canal building craze of the 1830s there were all kinds of work-arounds for places that you couldn’t force water to run uphill. A well-known example is the Pennsylvania Canal portage rails, which were invented so that Pennsylvania could compete with the Erie Canal.

    The Allegheny Mountains forced all kinds of odd curves and detours onto the path, but at several places the grades became so severe that they needed to load the canal boats onto bogies and winch them up the mountain to be dropped back into the canal which continued on the other side.

    http://www.jaha.org/edu/flood/why/img/canal_gallery/pages/allegheny_portage_rr_plane_.html

    Today the state maintains a park at the site of one of these inclines, just outside of Lilly.



  3. wangi Avatar

    The Falkirk Wheel replaces the original stair of 11 locks (inclined plane?) which linked the Union with the Forth and Clyde Canal. Another interesting feature on the Union is the tunnel at Hallglen: “As William Forbes refused to allow the canal to pass within sight of his property, Callendar House, this tunnel, the only canal tunnel in Scotland, had to be constructed under Prospect Hill. The tunnel, which is 690 yards in length and has a towpath running right through it” (although not the only tunnel now; as another was built at the same time as the Wheel, under the Antonine Wall no less)

    http://canmore.rcahms.gov.uk/en/site/46771/details/falkirk+union+canal+canal+tunnel/ (with photos)

  4. FS Avatar

    I visited the Falkirk Wheel a few years back-it’s quite a sight.

  5. Katy Avatar
    Katy

    There’s also a place in the Netherlands where one can drive under a canal, though it’s more of a 20th century construction:



    Another view: http://www.panoramio.com/photo/221986

    1. wangi Avatar

      Which reminds me of the canal aqueduct which crosses the M6 Toll in the UK; things is the canal isn’t connected up – it’s in anticipation of the canal being reconstructed.

      http://en.wikipedia.org/wiki/Lichfield_Canal#Restoration

  6. Thias Avatar
    Thias

    Hey!
    The french inclined plane you mention is about 10 miles from my home!

    1. Twelve Mile Circle Avatar

      Thias, have you visited the incline? Is it truly as odd as it looks?

      1. Thias Avatar
        Thias

        I did visit it, although I never really understood all the mediatic ‘buzz’ around it. It’s a little strange, but when I visited it – and used it, because you can board a boat and use the plan – my main reaction was: “meh”.

  7. Guy Avatar
    Guy

    Hi, great blog! I discovered it through your comment on Strange Maps.

    There is an inclined plane in Ronquières, Belgium, see this Wikipedia article. And here is a list with another few.

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