I've heard a few people state that they believe ATV's (4-wheelers) would not make it down to the bike disposal site. Why?! I have seen the pictures and I still think there would be a way for one to make it down there...somehow.
We have many places, where I live, that look like you would never ride on in a million years, yet those are the most popular places for kids and young adults b/c the "older" folk wouldn't take those chances to get there. Especially w/ the artwork down there, it's obviously a place where kids would hang out (at night most likely b/c they wouldn't have the "cojones" to destroy property during the day in front of people). I don't know---we do stupid stuff here in Illinois and I have been thrown from 4wheelers, dirtbikes, and snowmobiles more than once and mudding is a past-time. You would be surprised at how skilled young drivers really can be...especially when that's all there is to do! We also party anywhere along water's edge...and most places are not accessible by a regular vehicle, but we always found a way in. I used to ride my car down the railroad tracks to get to a certain party spot...you'd be surprised at what the young know about and what the adults have NO CLUE on. I think it's very plausible that someone could of taken her and her bike or just her bike to that area via atv---they have racks on the back, storage, lights, it's easy to kill the motor and lights if a vehicle were coming so they'd never even know you were around. Nothing is Impossible.