pontoon bridge

a bridge supported by pontoons.

Origin of pontoon bridge

First recorded in 1695–1705

A pontoon-bridge was at once begun, finished by night, and the troops began the passage.

The Memoirs of General W. T. Sherman, Complete |William T. Sherman
A train had come in, bringing on it a pontoon-bridge which was to be thrown across the stream at Caperton.

An Undivided Union |Oliver Optic
Already a pontoon-bridge has been thrown across the Marne at Meaux.

Beyond the Marne |Henriette Cuvru-Magot
The picket guard of the enemy was driven away, and soon the pontoon-bridge was in position.

An Undivided Union |Oliver Optic

Chess, ches, n. one of the parallel planks of a pontoon-bridge—generally in pl.

Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) |Various