The James F. Byrnes Bridge was built in 1956. It was a two-lane toll swing bridge constructed at a cost of $1.5 million that opened the island to automobile traffic from the mainland. The swing bridge was hit by a barge in 1974, which shut down all vehicle traffic to the island until the Army Corps of Engineers built and manned a pontoon bridge while the bridge was being repaired. The swing bridge was replaced by the current four-lane bridge in 1982.