back button Pontcysyllte Aquaduct, Llangollen Canal, Wales  
 
Now a World Heritage Site, this aquaduct was built in 1795-1805 by Thomas Telford. At the time no-one knew if it could be done, as nothing like it had ever been built. Telford carried the canal for 1000 feet across the River Dee valley in cast iron troughs - 126 feet up - atop huge masonry columns. The troughs were sealed with welsh flannel and tar, and the stone mortared together with lime and ox blood. And guess what - it's still in almost perfect condition after over 200 years ! They obviously built things to last in those days.


 
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  The view across when you first arrive...   The iron troughs resting on their masonry columns.  
 
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  At only a few inches wider than a narrowboat you have to wait if anyone's coming in the other direction.   Telford's joints between the cast iron sections are still watertight today.  
 
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  There's not much between the edge of the boat and the 120' drop.   And that's us coming back again the next day! The crew ran ahead to take this photo.