Report 41782: Man-like figure seen running along a tree-line off Hwy. 12 near Checkerboard

It was about 3 p.m. Early in December of 2012. I was up at my cabin cutting up an elk and had to run into town to get some pork suit for hamburger. I have made it a habit to keep track of where the ranchers have their cattle near the highway so I know where the elk will or will not be. On my way back I was driving about 60 mph while scanning a ridge side and tree line where I had seen elk before when I noticed something very out of place and very dark running along the tree line. I don't know whether it was cause I was in disbelief or I was just being a good driver, but I literally did a triple take after noticing it. It was about 230 to 300 yards away and I could make it out quite well. The thing was on two legs, had very long arms that seemed to end barely above the knees, its head was positioned as if a person were sticking their neck out, and it ran while barely moving its arms. It didn't look like it was alarmed, just as if it were just going along its way heading back into the mountains. In scale to the trees I'd say it was about six a half feet tall.  I watched it for about ten seconds or so ( as much as I could without wrecking, don't know why I didn't stop) and there's no way it was anything else. I've had a few other encounters, but nothing as concrete as this. There was no way this thing was anything else.