You said something about the closest marker on the map was Halls Crossing? Maybe you know, that is one of the hearts of Lake Powell, as far as visitation. Any canyon accessible from the lake in that area would have a wide "variety" of people camping and hiking there since the 70s. Lake levels too would have made some areas much more accessible than today... a few maybe less.
I am interested in where.
Anywhere that would have to be accessed by lake would be a solid no during winter.
As an example of what people do...In Escalante there is this thing.... visible in GE and recently improved last time I was there. Someone spent a lot of time moving around lava boulders. I hope they were not trying for 69, instead of 96...
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