The top part of the bridge is made up of special five sided timber constructions laid carefully on the stone footings built in the river in created coffer dams. At least five of these timber structures are placed side by side on the stone footings and tied together with crossbeams which form the basis of the bridge floor. Planks are then laid upon these timbers, and on them turf or dirt and brush to soften the impact of wagon wheels on the bridge planks.
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