Link from Arch Pontoon Bridge

Half a croissant, on a plate, with a sign in front of it saying '50c'

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American Land Bridge
Arch Pontoon Bridge
Ballistic Bridge
Bering Strait Bridge
Bridge Across the Ocean
capitalised bridges
Floating Bridges
Foolproof Bering Strait Bridge
Gently moving river which contains the antithesis of its own crossing
...

public: bridge

Arch Pontoon Bridge
It's What They Call No Rise And Fall

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The buoyant arch pontoon bridge is a pontoon bridge similar to many others but with deep over-buoyant pontoons pushing the deck up into the shape of an arch, in permanent tension because the pontoons are so buoyant. So the deck doesn't go up or down; it's tied down to the river banks. Long crossings can be made with a series of arches; where they meet the pontoon is anchored down to the river bed with big piles. Simple. Excellent.

Harry Mudd, Aug 22 2007