Quotethe four passes on the NT route might result in me being pushed in front of a logging truck.I did it last summer and didn't particularly notice logging trucks. It's a long way from Kettle Falls to Sherman Pass, make sure you have plenty of water because there's none on the way.
Sherman Pass is big but a steady grade. Wauconda is pretty easy coming west from Republic. Loup Loup I remember as pretty rugged, but cheesehawk can take comfort in the lack of cell coverage climbing Washington Pass the fourth day; his sister won't be able to get a signal to arrange for a friend of a friend to meet him with a lumber truck.