The Sherman Pass area used to be considered one of the top place in Washington to take a really large mule deer. I remember national magazines having articles about the hunting there when I was a teenager. That's what got me to hunting it in the early 60's. The first mule deer buck I ever saw/shot was a 6 X 6, 27 1/2 inches wide. I can look over my shoulder as I write this, and still admire the horns.
This area is hunted when snow brings bucks down near the road by the Colville tribe. They won there hunting rights in 101 several years ago. I am guessing but that may be why they leave them alone, plus a much smaller population than what it used to be.