an earthwork sculpture constructed on the northeastern shore of the Great Salt Lake near Rozel Point in Utah, in April 1970 that is considered to be the central work of American sculptor Robert Smithson.
Built of entirely of mud, salt crystals, basalt rocks and water Spiral Jetty forms a 1,500-foot-long (460 m), 15-foot-wide (4.6 m) counterclockwise coil jutting from the shore of the lake. The water level of the lake varies with precipitation in the mountains surrounding the area, revealing the jetty in times of drought and submerging it during times of normal precipitation.
Originally black basalt rock against ruddy water, Spiral Jetty is now largely white against pink due to salt encrustation.