The Joan Hill Lynch Plaque is near the top of the Elk Camp lift on Snowmass. It states: "Over this mountain lie the ashes of our wife & mother, Joan Hill Lynch, 1932-1989."
This page contains the following information on Joan Hill Lynch https://billiongraves.com/grave/Joan-Hill-Lynch/9003947#: "Grave information for Joan Lynch (Hill), located in the College Cemetery, Ames Iowa. This headstone image, GPS location and personal data were contributed and verified by volunteers to provide you with the most valuable cemetery and genealogy data in the world." She was born on August 30, 1932 and died on November 11, 1989. The page also contains a photo of her grave stone (shown below).
Photos of the plaque on Snowmass, taken by the author in June of 2016, are the first 4 photos shown below. Click on images to enlarge.