With the exception of the Triple Creek Ranch [1], which feeds its clients quite well, don’t expect to find fine dining in the Upper Bitterroot. There are a few cafés in Darby, and the country store in Sula has a small restaurant.
Links:
[1] http://www.moon.com/destinations/montana/missoula-and-northwestern-montana/the-bitterroot-valley/the-upper-bitterroot/resorts-and-luxury-cab