Diana Duelly of Grand Lake had been walking with her dog along the shore of Shadow Mountain Reservoir for just a few minutes Thursday afternoon when the moose came charging out from some trees and bushes and rammed her, her boss, Bob King of Pancho and Lefty's restaurant, told Granby's Sky-Hi News.
King said Duelly told him she was knocked unconscious and didn't come to until medical personnel arrived on the scene, the newspaper reported.
Duelly was flown to a Denver-area hospital where she was being treated for skull injuries and was expected to need surgery on one eye, King said.
The newspaper said a Colorado Parks and Wildlife spokesman said officials were unable to determine which of several moose in the area had attacked the woman.
The newspaper noted another woman walking her dog was attacked by a moose in the driveway of a friend's home in the Grand Lake area last spring. That woman also required hospitalization.