With all due respect, Waterfall Glen is a forest preserve in the middle of suburbia, with a large laboratory in the center, with at least 3 major roads surrounding it. It would be very hard to get lost there for any extended period of time. The “waterfall” is man-made, & only about 6 feet or so above the creek (and I’m sure the creek is nearly dry as we haven’t had much rain in over a month).
IMO: I still think he either ditched his car there & went elsewhere, OR he unfortunately wandered down by the river (which is sizable, regardless of rainfall).
ETA: Oh, I figured out how to add a screenshot haha.
Blue: Parking lot where Jake’s car was found.
Red: Des Plaines River, canal, & quarries.
Yellow: Argonne National Laboratory.