Sharon Brussell was supposed to show up at an event near Arches National Park and people became worried when she didn't appear.
After they were alerted, Grand County Sheriff's Office deputies began searching for Brussell on a bike path she had been known to frequent.
She was finally found in the quicksand with one of her legs stuck up to the knee after about 14 hours in the sticky substance.
It took four people to dig her out because the displaced sand kept sliding back.
The park employee said she was aware of quicksand forming in the area in the past, but indicated that it was a rare occurrence.