Durango is an outlier for the west slope. GJ is the biggest city on the west slope. It's been a year or two since I've been back, but there's one brewpub there that's awful, but always busy. There's another that's way better but not nearly as busy. I think they were working on adding another one, but I don't know the story on that.
In Fruita, there have been a few people who tried to start a brewpub, but they went out of business quickly. The beer was pretty good, but I think most people in Fruita go to bars in GJ. I think Palisade brewing is doing OK, but their beer isn't fantastic.