As stewards of Spiral Jetty, Dia is committed to recording changes to the work over time through photographic documentation. Since 2012, a geospatial aerial photographer has documented Spiral Jetty once or twice annually in the Spring and/or Fall.
All following images are Robert Smithson, Spiral Jetty, 1970. © Holt-Smithson Foundation/Licensed by VAGA, New York. © Aero-graphics, Salt Lake City