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Grizzly · 27-05-2010, 05:53 PM posted to misc.rural,rec.gardens

Larry wrote:
In article , says...

When the Rockville bridge was built across the Susquehanna River (PA)
in
1900-1902, it was described as the longest stone arch bridge (3,280') in
the world. (Not entirely true because it was concrete filled.)

There's a stone arch bridge across the river entering Merida, Spain,
that was constructed by the Romans and is still carrying 2-lane highway
traffic, including trucks. It's been a while since I was there, but I
don't think it's quite as long as yours. I also remember that one arch
looked like it had collapsed and been repaired. The later stone work
was not as high quality as the Roman masonry.

It probably fell during an earthquake. Barring that Keystone arches are
some of the strongest structures you can build with stone.