A dark figure in Dawes County, Nebraska

I had never thought of looking on the internet to report what my ex-girlfriend, a friend, and I saw one night. Didn't know a nationwide report site was on the net. At the time we were students at the local college. We drove one night out to Red Cloud campground, adjacent to Chadron State Park, and parked in a parking pad at a campsite. We were in the car with the windows up. I recall the exact campsite. It was a full moon on a fall night in September of 2003. The grass was still green. This location is in the Pine Ridge, an escarpment, a part of Nebraska National Forest, just adjacent to Chadron State Park. We were parked facing up a ridge. We had been sitting for about a half an hour, when uphill in an area clear from some trees (this area is mostly covered by ponderosa pine trees), about 40 ft away we saw something on two feet run across our view out the front window, had to be running at least 30 miles an hour. From the silhouette that we saw, it was very tall, not exceptionally bulky. It had a rangy or sinewy build and looked muscular from the silhouette. It was a full moon, but there are no lights in or around this campground. It ran by way to fast to notice any hair features. We all looked at each other, like, "What the f*** was that". We were all bewildered, and my girlfriend was really scared. I definitely knew we had witnessed something extraordinarily strange, and we got the hell out of there. We didn't even go around the loop to turn around because that was toward where it was running. Note that we knew there was no one at all parked or camping up there while we were there because we went around the loop upon entering. We went back there the next day during the daylight to see where it would have been running. There is a lot of brush, grass, stumps, and bushes where this thing was running through, and in my opinion, there is no human that can run that fast through there even in the daytime. I've told people I might have seen Bigfoot, but like most people, they just think I'm full of it. I don't lie, and I would never have anticipated seeing something like that. As to my knowledge at that point, there were reports of Bigfoot in the Pacific Northwest area, not Nebraska. I camped at the campground last summer with my current girlfriend. Didn't see anything unusual, but got really bad vibes after revisiting my past memory. We were the only one's camping out there. Every other time we went camping out there it was with multiple people.