The dendrochronological analyses of a large number of timbers from two sites are described. Nybro causeway in west Jutland, Denmark, which was built in the 8th century AD, consists of numerous phases, identifiable due to the large number of dendrochronologically dated timbers, of which many had complete sapwood, to bark edge, preserved. Skjern Bridge, across the Skjern River and also in west Jutland, is medieval in date, with phases from the 12th to 14th centuries. The bridge is one element in a complex of activity by the river including an earlier ford, a fish weir contemporary with the bridge, and a later bridge of timber and stone, which replaced the all-timber medieval bridge.