From Lewistown, MT, take US Highway 87 west to the Glengarry turnoff.  Exit south onto Glengarry Road.  At the T at Glengarry turn right onto McMillan Road.  Continue to the fork just over the hill.  Turn left onto Beaver Creek Road.  Stay on Beaver Creek Road for 12.5 miles.  You will see the cabin from the road, it will be on your right (west). 

At the main forks, there are yellow and black Montana Bunkhouse signs that point the way.