Question: What is the bridge near Clark Island made of?

full_context: Document 1: Sydney Harbour Tunnel: The Sydney Harbour Tunnel is a twin-tube road tunnel in Sydney, Australia. The tunnel was completed and opened to traffic in August 1992 to provide a second vehicular crossing of Sydney Harbour to alleviate congestion on the Sydney Harbour Bridge. It is the only tunnel under the harbour, although there are plans to build a set of rail tunnels.
Document 2: Rodd Island: Rodd Island is a 6700 m2 island on the Parramatta River in Sydney, Australia. It lies in the centre of Iron Cove, between the suburbs of Drummoyne, Russell Lea, Rodd Point, Haberfield and Leichhardt. It is located west of the Sydney Harbour upstream and the Harbour Bridge. Today the island is uninhabited, and forms part of the Sydney Harbour National Park. The island has had various other names over its history: Rabbit Island, Rhode Island, Snake Island and Jack Island.
Document 3: 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.
Document 4: Clark Island (Washington): Clark Island is an island in the San Juan Islands of the U.S. state of Washington. It is located near Barnes Island off the northeast coast of Orcas Island. Clark Island State Park, which encompasses the entire 55 acre island, has two picnicking sites, 15 primitive campsites, and nine mooring buoys.
Document 5: Bayonne Bridge: The Bayonne Bridge is an arch bridge spanning the Kill Van Kull connecting Bayonne, New Jersey with Staten Island, New York City. It carries NY 440 and NJ 440. The Bayonne Bridge is the fifth-longest steel arch bridge in the world, and was the longest in the world at the time of its completion. The bridge is also one of four connecting New Jersey with Staten Island; the other two roadway bridges are the Goethals Bridge in Elizabeth and Outerbridge Crossing in Perth Amboy, and the rail-only Arthur Kill Vertical Lift Bridge, all of which traverse the Arthur Kill.
Document 6: Brooklyn Bridge: The Brooklyn Bridge is a hybrid cable-stayed/suspension bridge in New York City and is one of the oldest bridges in the United States. Started in 1869 and completed fourteen (14) years later in 1883, it connects the boroughs of Manhattan and Brooklyn by spanning the East River. It has a main span of 1595.5 ft and was the first steel-wire suspension bridge constructed. It was originally called the New York and Brooklyn Bridge and the East River Bridge, but it was later dubbed the Brooklyn Bridge, a name coming from an earlier January 25, 1867, letter to the editor of the "Brooklyn Daily Eagle" and formally so named by the city government in 1915. Since opening, it has become an icon of New York City and was designated a National Historic Landmark in 1964 and a National Historic Civil Engineering Landmark in 1972.
Document 7: West Gate Bridge: The West Gate Bridge is a steel box girder cable-stayed bridge in Melbourne, Victoria, Australia. It spans the Yarra River, just north of its mouth into Port Phillip, and is a vital link between the inner city (CBD) and Melbourne's western suburbs; with the industrial suburbs in the west and with the city of Geelong, 80 kilometres (50 mi) to the south-west. It is one of the busiest road corridors in Australia.
Document 8: Hoddle Bridge: The Hoddle Bridge is an arch bridge over the Yarra River between Richmond and South Yarra, Melbourne, Australia. It carries Punt Road across the Yarra. It is a four-lane road bridge with narrow footpaths on either side. It is of continuous reinforced concrete T-beam construction with five segmental arched spans, supported on transverse piers, and linked by concrete cross-beams.
Document 9: Sydney Harbour Bridge cycleway: The Sydney Harbour Bridge cycleway is a 2 km conjoined cycleway from the north and south that crosses the Sydney Harbour Bridge on its western side, linking the Sydney central business district with North Sydney, Sydney's Northern Suburbs and the North Shore, in Sydney, New South Wales, Australia.
Document 10: Sydney Harbour Bridge: The Sydney Harbour Bridge is a steel through arch bridge across Sydney Harbour that carries rail, vehicular, bicycle, and pedestrian traffic between the Sydney central business district (CBD) and the North Shore. The dramatic view of the bridge, the harbour, and the nearby Sydney Opera House is an iconic image of Sydney, and Australia. The bridge is nicknamed "The Coathanger" because of its arch-based design.
Document 11: Port Jackson: Port Jackson, consisting of the waters of Sydney Harbour, Middle Harbour, North Harbour and the Lane Cove and Parramatta Rivers, is the ria or natural harbour of Sydney, New South Wales, Australia. The harbour is an inlet of the Tasman Sea (part of the South Pacific Ocean). It is the location of the Sydney Opera House and Sydney Harbour Bridge. The location of the first European settlement in Australia, Port Jackson has continued to play a key role in the history and development of Sydney.
Document 12: Clyde Arc: The Clyde Arc (known locally as the Squinty Bridge), is a road bridge spanning the River Clyde in Glasgow, in west central Scotland, connecting Finnieston, near the Clyde Auditorium and SEC with Pacific Quay and Glasgow Science Centre in Govan. A prominent feature of the bridge is its innovative curved design and the way that it crosses the river at an angle. The Arc is the first city centre traffic crossing over the river built since the Kingston Bridge was opened to traffic in 1969.
Document 13: Milsons Point ferry wharf: Milsons Point ferry wharf is located on the northern side of Sydney Harbour serving the Sydney suburb of Milsons Point. It is next to Luna Park and the Sydney Harbour Bridge. It is served by Sydney Ferries Parramatta River and Darling Harbour services operated by First Fleet and RiverCat class ferries.
Document 14: Ku-ring-gai Chase National Park: The Ku-ring-gai Chase National Park is a protected national park that is located in New South Wales, Australia. The 14977 ha national park is situated 25 km north of Sydney located largely within the Ku-ring-gai, Hornsby, Warringah and Pittwater local government areas. The villages of Cottage Point, Appletree Bay, and Bobbin Head are located within park boundaries. An isolated portion of the park; Barrenjoey Headland, is located to the north of Palm Beach east of the primary park body and is home to Barrenjoey Lighthouse.
Document 15: Montague Island (Australia): Montague Island is a continental island contained within the Montague Island Nature Reserve, a protected nature reserve that is located offshore from the South Coast region of New South Wales, in eastern Australia. The nearest town located onshore from the 81 ha reserve and island is Narooma , situated approximately 9 km to the northwest.
ground_truth: steel