This is a log road made from heavy timbers or split tree trunks resting crossways on heavy timbers / logs laid on a marshy base. As you can see most of the bridge is constructed of split logs, however one section is made of heavy beams, perhaps garnered from a nearby wooden building. This kind of structure is a temporary road used to cross marshy areas that would otherwise bog down wagons, horses and foot soldiers. The small stream in the center of the bridge uses stones to support the bridge portions of the road.
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