At the time it was built, in the 1960s, this was the longest concrete arch bridge in the world.
(There are many longer than this now, mainly in China.) It replaced a low-level bridge with an
opening span; it had trams, I remember! The idea was to allow clearance for the size of ship
likely to use new port development upstream. But nothing taller than a good-sized yacht goes
this far up the harbour, and there's never going to be any port development upstream.