Spiral Jetty, a huge work by U.S. artist Robert Smithson that extends out into Utah's Great Salt Lake, is threatened by an oil company's plans to explore in the area. The Dia Foundation, a non ...

His best-known work is the Spiral Jetty in the Great Salt Lake in Utah which was made in April of 1970. Three years later, Smithson was killed in a helicopter crash.

The jetty, which was built by moving rock boulders to the red translucent waters of the lake, had been largely submerged for decades. However, lake water levels receded last in 2002, exposing the ...