I live along the route between Eureka and Whitefish. The first stretch from Eureka has good shoulders, clean and wide, until about the county line at Mile marker 157, which is about 20 miles SE of Eureka. After that the shoulders narrow to between 1 and 2 feet of pavement on the outside of the white line. The only really bad stretch is the last few miles before you get to Whitefish. The pavement ends at the white line, it's rough and bumpy off the pavement with washouts. The road is curvy and the speed limit is 60 through the curves (It was 70 but they lowered the speed limit this spring on that few miles). The traffic isn't bad during the middle of the day. Mornings until around 9:30 have heavier traffic, as does evenings between 4:30 and 6:30. Overall the traffic isn't really that bad. Drivers are used to a lot of bicycles out there.