Barking squirrels have their own coconut telegraph that is for certain, sometimes it is because they do not understand what they see or encounter if it is novel to their environment, a sort of alarming surprise. 

Amazing, I think many people would trade their sighting just to see a Bigfoot butt crack in the hillside ecotome, lol.    No seriously, the fisherman confirming the scenario would be a cool read if in the BFRO or other database?    Do you recall whether the fisherman could detect gender, and are you certain that could not have been cleavage of another sort?  Just funning you here of course.  Thanks for the report and drawings. It is possible @joebeelart is familiar with this sighting and/or stomping grounds.  Joe? 

I will elaborate on this at a later date.

My family and myself went on our annual Easter picnic with a group of families to the upper Mill Creek Park located mid way up the Oregon coast on the east side of the Coastal Range west of Dallas Oregon. The park no longer exists and is now a grown over clearcut, but at the time it was in old second second growth Douglas fir as well as old growth fir and hemlock. Once we were there for a while, my buddy Jeff and I decided to explore the steep hillside across the road from the park by using "elk highways" going along the hillside. These elk trails were cut into the bank and about 3 feet wide from decades of use by elk, deer, bears and all manner of critters. The park was located at the confluence of Mill Creek, Cedar Creek and Camp Creek many miles into the wilderness. The hillside in that particular spot, was very steep and filled with layers of forest duff. If you were to descend the slope, you would take a step and slide 3 to 5 feet, then take another step and slide another 3 to 5 feet on down to Camp Creek, causing quite a swath of fresh earth displacing the forrest duff. The foggy coastal air and this fresh dirt lent to preserving a butt, hand, forearm, and heel prints into the bank very well. We came across such prints and were amazed at the size of them. Standing in the heel prints the butt print as high as my shoulder blades and much wider than my back. Its forearm, from elbow to wrist, was a bit longer than my entire arm from my shoulder to my fingertips and the palm of the hand was bigger than my entire hand with my fingers stretched out as far as I could stretch them. The fingers were fairly long and spread out wide. I don't remember thinking the thumb was out of proportion. But why would I analyze that, not knowing what to look for? It had come off of the upper road, sliding down this hillside, came to rest with it's heels onto the elk trail, which caused it to suddenly stop, falling backward onto the freshly disturbed  bank with it's butt and forearm and pushing off with it's hand and continued on down to the creek. We tried to rationalize every scenario we could think of, but nothing fit. Was it a giant hunter? There was no hunting season going on and the heel prints were not boot heel prints and the butt print had a distinct crack as if naked and not clothed. I giant fisherman? What fisherman would go through the difficulty of descending such a hillside, when they could easily access the creek from the lower road. And the whole naked butt, no boot print thing too. We later concluded that it had to be a bigfoot. A very uncomfortable conclusion, but the only one that made sense. I never told anyone about this for a long while.   The thing that cemented to me, that this could only be a bigfoot, is what my mom had to say about 3 days later. She came into the room my brother, dad and I, were sitting and said she heard on the news that a fly fisherman was fishing one of the creeks by the upper park the day after our picnic and when he came around the bend of the creek, he saw a giant bigfoot standing in the creek.  I think that is all I have on this.

This outing hurts, because I could have possibly seen one doing would knocks, but not understanding squirrel behave, caused me to use misjudgement.