Possible sighting by family walking their dog near Auburn witnessed in Placer County, California

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ok. this story is happening right now...went out with my kids, my sister & my girlfriend to the park in auburn ca. after that we went driving through a very rich housing development to see the address signs that i made for the houses at my work, we were close to a lake called lake arthur. it was about 7pm? sunday, today, sept 30? we walked along the trail there about 30 ft. came upon a large tree branch or small tree, about 13 ft long, 12" in diameter. i picked it up on end and tumbled it down the small hill side/river bank, then again to get it in the water...very heavy. no apparent reason for it to be lying across the path at all. continued on deeper down the path about 1/4 mile or more to a dead end. by this time it was very minimal light, started walking back our dog took a crap in the path ahead, and you could see it darker on the yellowish oak leave covered dirt path, and we could see to avoid it, when we got to the area that i moved the tree, my son said to me, watch out there i...