A big parking area running for nearly 1/2 mile commonly used to run the lower from Rockport
If meeting here make sure you know which lot or what cars to look for as there can be hundreds of people putting in and far more riding or walking or exploring.
A note on the Lehigh shuttling. Participating in shuttle is part of the trip. With longer shuttles and most KCCNYers having a shorter drive home from one end or the other its tempting to shirk. Failure to help with shuttle is grounds for not being allowed to participate in the trip or even removal from KCCNY.
More details on the Lehigh at https://kccny.org/locations/lehigh-river/.
Video of the Rock to Glen section at 1600. https://www.youtube.com/watch?v=GGbaDE5bMtg