What is the bridge near Clark Island made of?
Clark Island (New South Wales) Clark Island is a small island in Sydney Harbour, near the coast of New South Wales, Australia. The island is part of the Sydney Harbour National Park and lies offshore the Sydney suburb of Darling Point, in the eastern part of Sydney Harbour between the Harbour Bridge and the harbour entrance.
Lower Blackburn Grade Bridge The Lower Blackburn Grade Bridge, also named the Van Duzen River Bridge or Mile 18 Bridge, is a 258 ft reinforced concrete through arch with a main span approximately 150 ft over the Van Duzen River about 4 mi west of Bridgeville, California, United States. It was active from its construction in 1925 to 1985 when replaced.