The first bridge
is likely to have been for pedestrians only. The Military Way, however,
required a road bridge.The outline of a diamond-shaped pier from the
first bridge is visible in the abutment area directly west of the tower
that here marks the wall's arrival at the river (east bank). The pier
has cutwaters in both directions. It was built into the structure of
the later bridge, now revealed by the removal of stones during consolidation
work in 1982.
The first bridge
is thought to have had stone arches, probably set on eight piers. The
second had a timber superstructure on fewer, larger, stone piers. One
is buried in the river bank. Two others have been detected in the river
itself.