ARIMER COUNTY - The Larimer County Sheriff's Office says the woman's kayak overturned on the Poudre River, along Highway 14, near Fort Collins.
The name of the 48-year-old woman is not being released.
Shyler King, a rookie rafting instructor helped save the woman.
"Apparently she re-circulated too many times," says King, "she got in a hole or something and it kept spinning her around and around."
Emergency workers say the woman was in the water for about two minutes and floated down the river, approximately four-tenths of a mile, before being pulled out by people in the area.
King's raft was passing by, he says he saw people on shore performing CPR, they asked for help.
King and another rafter, a paramedic on vacation from Austin, Texas, tried to revive the woman.
"She was pulseless," says King, "she wasn't breathing at all, her lips were blue, she was very pale. Luckily, we got some color back, I hope she's okay."
The 48-year-old was flown to Poudre Valley Hospital in Fort Collins, where she's listed in critical condition Saturday.
Investigators say her name will not be released until her family is notified.
--Props to all involved. Sounds like a pretty heroic effort.. Hopfeully she recovers well.