Emergency personnel airlifted an injured woman from Chicago Basin on Monday to Mercy Regional Medical Center.
The woman was "seriously injured" by falling rocks while hiking in the area, said Butch Knowlton, La Plata County director of the office of emergency management. The victim was on the Twin Lakes trail system.
Her name and condition were not available Tuesday.
Authorities were alerted to the emergency by a satellite phone call, Knowlton said. The phone call was poor quality, but authorities were able to decipher enough information to launch a rescue operation.
The victim was rescued by a helicopter from New Air Helicopters of Durango after she was carried to the aircraft by other hikers and a paramedic, Knowlton said.
Chicago Basin, located in the Weminuche Wilderness north of Durango and east of U.S. Highway 550, is a popular destination for summer backpackers.
It was the second rescue operation in two days. On Sunday, a Telluride woman, Angela Mallard, 45, was rescued from the Animas River gorge north of Rockwood after she broke her leg while kayaking.
Mallard had fallen out of the kayak, Knowlton said. Rescue teams on each side of the river set up lines across the gorge, rappelled into the canyon and pulled her to safety at night using a rope system. Mallard was transported out by a Tall Timber Resort train to an ambulance waiting at Rockwood.
County Search and Rescue personnel were assisted by a Durango Fire & Rescue Authority paramedic team and workers from Tall Timber Resort.