The bridge-tunnel originally combined 12 miles (19 km) of trestle, two 1-mile (1.6 km) long tunnels, four artificial islands, two high-level bridges, approximately 2 miles (3.2 km) of causeway, and 5.5 miles (8.9 km) of approach roads crossing Chesapeake Bay. Fun fact! In 1987, the tunnel of the bridge was officially named Lucius J. Kellam Jr. Bridge–Tunnel after one of the civic leaders who worked long and hard on the bridge. However, it’s more known now as Chesapeake Bay Bridge-Tunnel.