When you enter the Bitterroot Bunkhouse into your GPS it will direct you south on hwy 93 and you will take a left onto Eastside Hwy.
Your GPS will instruct you to take Hidden Valley Rd. (Do NOT take Hidden Valley Rd (this will add 8 miles of gravel road onto your ETA.)
Instead continue South on Eastside Hwy until you hit Dry Gulch rd. Take a left onto Dry Gulch and take this road past the cattle guard. Dry Gulch will turn into Willy's Way Rd and you will see the Bitterroot Bunkhouse on the right hand side!