Forgot to mention that when you cross the Elk River after Roosville, there is a nasty little hill. 8% for 2 km:http://www.flickr.com/photos/davez2007/3673821956/in/set-72157620763740044
Then PR 93 has one of the craziest false flats I have ever ridden:http://www.flickr.com/photos/davez2007/3673822746/in/set-72157620763740044
It extends all the way to the junction with PR 3. I couldn't understand why I was having such a hard time until I turned around and saw that I was actually gaining elevation.
Finally, while I haven't ridden it, it's my understanding that U.S. 93 is not the optimal way to get between Missoula and the Big Fork area. The east side, which I rode back in '00, (Rtes. 200 and 83, if I recall correctly), is supposed to be nicer.
From Big Fork, U.S. 2 might be flatter than 93. If you go that way, I would avoid cutting over to 93 on Rte. 40 if you can. Heavy traffic and noisy in '09. We only took it because our hotel for the end of the trip was on 93. Instead, stay straight on Hamilton to Edgewood.
Bring ear plugs if you plan to camp at the state park in Whitefish. It's close to the rail yard. We started the trip from the KOA on 93.
If you walk around Whitefish, don't miss seeing Frampton & Morrison in an old F.L. Wright building. Best law firm name ever. They also have an office on 93 in Eureka.