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I've seen this type of stuff in Washington since I started hunting here in '88. I've seen crude blinds, made like your example, elaborate creations like rock forttresses and cabins framed with poles and covered with blue tarps in every drainage I have ventured into. Just to the east along Manastash ridge is a blind built like a log cabin. Overlooks a great open vista. Farther down the ridge you'll find several rock structures, some with stoves provided! One blind has a great carved image of a naked lady in the surface of the gray deadwood log. Like I mentioned earlier, I have never seen so many makeshift cabins. I started hunting in Montana, and it seem like the leave no trace method was used more often. It is rare to see a clean camp site here in Washington.