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Spiral Jetty is an earthwork sculpture constructed in April 1970 that is considered to be the most important work of American sculptor Robert Smithson. Smithson documented the construction of the sculpture in a 32-minute color film also titled Spiral Jetty.

Built on the northeastern shore of the Great Salt Lake near Rozel Point in Utah entirely of mud, salt crystals, and basalt rocks, Spiral Jetty forms a 1,500-foot-long , 15-foot-wide counterclockwise coil jutting from the shore of the lake.

The sculpture is sometimes visible and sometimes submerged, depending upon the water level of the Great Salt Lake. Spiral Jetty is now largely white against pink due to salt encrustation.

In 1999, the artwork was donated to Dia Art Foundation. Since its initial construction, those interested in its fate have dealt with questions of proposed changes in land use in the area surrounding the sculpture.

See more Land Art here.