Conversation so far:
where was the spiral jetty created before it disappeared due to erosion
Robert Smithson chose the Rozel Point site for the Spiral Jetty at Great Salt Lake, Utah.
The Spiral Jetty is still visible at Great Salt Lake?
In the early 2000s sustained drought in Utah caused water levels to recede, and Spiral Jetty became visible for the first prolonged period in its history.

Question: how is the sculpture preserved
Self-contained rewrite: How is the preservation of the Spiral Jetty handled?