Authorities are searching for 21-year-old Kaitlin Anne Kenney who's reported missing from a private 30-day river trip in Grand Canyon National Park.
Park rangers say the woman from Englewood was last seen Friday night at her group's camp near Tapeats Creek on the north side of the Colorado River.
Linnea Kenney, the woman's mother, said she believes her daughter did not survive when she accidentally fell into the frigid cold water.
The Kaitlin was reported missing Saturday and helicopter and ground crews searched the Tapeats and Deer Creek drainages, Surprise Valley and along the river all weekend.
Ground-based search crews were intensifying their efforts Monday in the Tapeats Creek area.
(KUSA-TV © 2013 Multimedia Holdings Corporation with The Associated Press)