My bad, it actually says it's 6 bucks to park:
"It's a class II-III run that is fairly short. There is a charge to enter and/or park in the take-out spot, Picnic Rock State Park, at mile marker 119. I believe it's $6 p/vehicle. Bring some "$1s" also for the Meetup fee of $2.
Let's plan to meet there at 10 AM."
Picnic rock is free, the lower put in is free, the upper put in at Gateway park costs $5.00 for parking.
Not trying to be a d-bag, just informing since some of the older guidebooks are no longer accurate.