This earthwork sculpture created in 1970 by American sculptor Robert Smithson is known as "Spiral Jetty" and is located on the north-eastern shore of the Great Salt Lake near Rozel Point in Utah. It is made of mud, salt crystals, basalt rocks and earth. The coil of the spiral is about 457 metres long and 4.6 metres wide. Unfortunately it was constructed during draught period when the level of the lake was low hence it frequently gets submerged when the water level in the lake rises above elevation of 1280 metres. As a matter of fact soon after its construction it remained under water for almost 30 years.
Nature and submergence for long duration in salt water has taken its toll and the spiral is decaying. Efforts to preserve it are under planning.
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Source of info: Wikipedia
More photos and info: Sculptor Robert Smithson's Page