Here is the thread that was started quite a while ago. But until they either come up with pictures, or the dna of a grizzley it is all speculation. I know of hunters that see a big brown faze black bear and swear it is a grizzley just by its size. A good test to tell the difference is on the Montana's gane and fish web site. You have to pass it to get a bear license.
there have been reports of Griz in Colo for years, back in the early 80's, when in collage at Durango, spent a lot of time around Wolf creek, the old timers up there (made friend with a old, old goverment cat hunter) said there is good population on Griz up there. There was a gris killed by a bow hunter in the 80's in the San Jaun's, it was all over the paper, guy spent some time in the hosp.
I just got back from my elk trip to Colorado and must say that I learned quite a bit about hiking in that one trip. I researched all I could on the internet and thought I was prepared going out. For the most part I was but I want to pass on a few major things I learned that helped me drastically!
1. Pack light. I know this may sound like common sense but believe me. After reading everyone's advice on what you need to pack, chances are your pack will end up weighing more...