I have not ridden Blewett Pass (Highway 97), but have done a great deal of hiking and snow shoeing in the area. For most of the length, it is a nice paved road with wide paved shoulders with painted fog lines. Approaching the summit, it is two lanes in each direction and one lane in each direction the closer to US-2 and I-90.

There is not nearly the amount of large commercial and logging truck traffic that you see on I-90 and US-2. It can get a little hairy in the winter due to snow, but you won't encounter that. When you are over there, check out the new Suncadia resort and see if it is good for bicycling. I keep meaning to pull off of I-90 to check it out, but have forgotten to do so.