<P> 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 . </P> <P> The main river span is 336 metres (1,102 ft) in length, and the height above the water is 58 metres . The total length of the bridge is 2,582.6 metres (8,473.1 ft). It is the third longest in Australia behind the 3.2 kilometre Macleay River Bridge and the Houghton Highway along with its twin the Ted Smout Memorial Bridge, and is twice as long as the Sydney Harbour Bridge . It is one of the highest bridges in Australia, most notably trailing the more iconic Sydney Harbour Bridge . </P>

What type of bridge is the west gate bridge