I ate at the Sagebrush on a recent stay in Grand Lake because it was featured on a list of GF-friendly restaurants that I got from the town's Chamber of Commerce. Although I found Sagebrush staff eager to TRY, they were not adequately versed on the GF diet to warrant a good review.
The manager himself took my order and tried to assure me by saying that he has a waitress on staff with celiac disease. He was clearly nervous, however, that she wasn't on hand that day. I selected an omelet from the menu that I thought would be safe and described in what ways it might need to be modified to meet my needs. I even gave him a homemade GF dining card to take back to the kitchen with my order. However, when the omelet came to the table, there was a pile of unsafe hash browns leaning up against it, despite the fact that he and I had discussed the shared deep-fryer. The manager also seemed surprised when I told him that I couldn't just scrape off the spuds and eat the omelet. He was perfectly kind and didn't object to starting over, but my confidence was shaken by the fact that I had to educate him about cross-contamination. Perhaps with time, their waitress will bring the entire staff up to speed on celiac disease; until then, however, I recommend avoiding the place.