The Stillwater Fork flows from the High Uinta Wilderness before forming the Bear River. Most of its lower stretches are easily accessed from the road However, to get to the best fishing, and a little more solgy70itude, getting into the backcountry is going to be your best bet.
We can't speak for the Stillwater Fork Campground but if you plan on camping near the Stillwater Fork we would recommend the Christmas Meadows Campground. The layout of the campground gives enough room for every site that you don't feel crowded. Amid towering pines and the river not more than 100 yards away, we couldn’t recommend it more.
Our standard rod for the Stillwater is our 7'6" 3 wt but a 9' 5 wt would be just as welcome on this river. There are plenty of opportunities to really get the line out and cast, something that a 5 wt is going to be better at than the 3 wt. The fish, however, are built more for your 3 wt rod. That's not to say that there are not monsters in the Stillwater that have migrated up from the Bear and have claimed a territory for themselves on this smaller river.
The further upstream that you travel the less frequently you will run into competition on the river. The stream itself doesn't receive a lot of pressure, but you would be amazed how trampled the path along the river is close to the campgrounds. Rainbows and Brook trout are the game fish that you will most likely hook into while fishing the river, but there is a population of Bonneville Cutthroat and if you catch one of these beauties take some time and admire Utah’s State Fish.
While fishing, be prepared, and a bit cautious, you never know what you might run into. Moose call the Stillwater home and for being as large as they are, are more than capable of hiding in the willows until you stumble upon them. The largest Bull Moose that we've ever stumbled upon was in the willows between the Christmas Meadows Campground and the river and made us more than cautious on that fishing trip. Remember, the further in the backcountry that you travel the more secluded you are. Bear, Mountain Lions, snakes, etc call those mountain home. Be prepared and enjoy the seclusion that comes with the wilderness.