Fisherman observes large, bipedal figure along Kalama River witnessed in Cowlitz County, Washington

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This is a story that I've never put down on paper, although I've told many people about it over the years. I was young a the time, but I am sure of what I saw, so I suppose it's time to report it. You'll forgive me if the details are sketchy, it's been about 16 years (I'm 28 now). I was steelhead fishing with my father on the Kalama river in southwest Washington state. My dad left me at a bend in the river (unfortunately, I was 12, so I don't know exactly where) and went down to fish out of sight from me. I drift-fished for a while, with no luck. Then I heard an odd "whack-whack" sound, and looked upriver. Across the river, about a 50-70 yards away, I saw a large, black, bipedal figure with a fish (maybe a steelhead?) in its hands. I say hands, not claws, because it repeatedly raised the fish overhead and brought it down on a rock, apparently to kill it. It moved its arms like a brachiating ape, overhead and down in a pretty large half-circle. What struck me most, other than ...