Interesting. Unfortunately this just has that "Urban Legend" feeling to it. Like many ghost stories on roads, or cemeteries. You can find them in every state, there's always a female in white, walking down the road late at night, you pull over, offer her a ride n either she gets in your car, or just disappears. (It differs in each region.) And this fits perfectly with all the claims all over the nation.
Well I've been there and one weird thing is the bars on the outside fencing...they are gripped as if by hand and pulled apart...its definitely unexplained, pretty creepy too.