Fisherman spots possible Bigfoot "playing" in water

I went fishing one day at the hatchery above the "y" on the Kincolith River I saw something I thought was a person, then moments later a bear. I saw this thing below me, about 150 yards away. I was curious about what I saw because it seemed like a strange spot for somebody to be swimming. So I whistled and yelled out a greeting thinking that it was just a tourist or maybe one of my friends. I even waved my arms to catch their attention, but all that happened was whatever it was stood up and looked at me. When it stood up, I thought maybe it was a bear. The sun was to its back and the thing never responded - it just stood there looking at me. I waved my arms again thinking that the sun had played a trick on me and if I could get it to notice me, maybe they'd wave back if it was a person. Maybe it would leave if it was a bear. So I went to go fishing but kept an eye on the figure below me. It never responded and that bothered me. It eventually went about it's own business as did I, but I kept watching it. It laid down in the water and just started splashing around like it was at play. About an hour passed and the thing was still there. Finally it made a move. It stood up and walked out of the water on two legs (it wasn't a bear). Not only did it walk out of the water like that but it walked away from my village which is right beside that part of the river. The part of the river where I witnessed this thing was approximately 2.5 ft deep. When it stood up I would guess it stood around 6 ft on top of that. It was as much the size that confused me as it was the un-responsiveness and the direction of its final turn. It left me with more questions than answers.