According to MS Streets & Trips, the quickest way is to take US15 thru Las Vegas, Salt Lake City to I-90 to Montana 200 to Clark Fork. Total est. miles is 1,391.
The shortest way is north on US15 to US395 (Victorville) to Bishop. At Bishop take CA6/NV360 to US95. Continue north on US95 to I-80, going NE to where US95 turns north again at Winnimucca. Continue north on US95 until you get just north of Sandpoint, ID, then take ID200 to Clark Fork. Total est. miles is 1,293.
Enjoy the trip. Either route will be very scenic. Allow a minimum to 3 days to avoid pushing too hard, and give yourself the ability to enjoy the scenery.
Paul <?)))>< Lake Almanor, CA
2002 Thor Tahoe 23FBGL TT, 28'