The Magruder Corridor runs from Elk City, ID to Darby, MT. It's a road cut thru the mountains of central Idaho, sandwiched between two wilderness areas. For the most part the road is passable with a high clearance vehicle or a 4x4, but there's a few rough spots along the way. A high clearance rig is definitely advised. It's a perfect BMW GS ride, except when there's snow on the road (as I experienced). I rode this trail in September '06, during a brief "Indian Summer", when the temperatures were in the mid-60's. There'd already been snow at higher elevations but much of it had melted off, except for a few bad stretches. The photos where you see the snow are stretches of road where I had to get off the bike and push, pull, and/or otherwise manhandle the 700 lb. bike by myself. Knobbies would've helped, but for this trip the bike was wearing dual purpose Tourances. There were a few hunting camps along the lonely 75 mile stretch from the Red River Ranger Station to the Darby Ranger Station. The trail is very remote and uninhabited. If I'd had a mechanical problem or dropped the bike I'd have been in big trouble. Thanks to careful riding and God's grace I made it thru to the far side. This route is definitely NOT recommended in wet/snowy weather. Travel time is about 8 hours. Bring camping gear and plan to spend the night in some of the most beautiful country on the planet.