To hasten erection of the 504-ft. span, it was necessary to proceed without waiting for completion of the piers. Falsework for this span, as mentioned, had been driven from the north end. The north approach trestle, piers and falsework for timber spans were driven and a temporary deck laid. One of the 70-ft. pony spans was used temporarily to span the excavation for the north pier, thus permitting the construction of this foundation.
