rode the area 2 yrs ago, started out from Green river guest ranch, to the Line Shack lodge! areas!
trails were groomed almost every nite,( marked real well too) and tons and tons of wide open medows, and bowls to play in, the places you cannot ride in, WERE well marked ,also!
there was Gas for sale at , green river guest ranch, and the Line shack, about 50 miles apart, and then there was a lodge, called elk ridge lodge, or something , at the end of the road, near parking lot that had fuel too.
I can tell you this, i rode the place for 8 days, and only seen 3 other riders, its pretty remote place so watch your fuel
I would say it was a great place to ride, snow was great, had it to our self's, and great smooth trails!
It didn't have a lot of real big hills, but there were a lot of smaller ones to play on that had some challange too!, short and steep!