That trail along Glen Onoko Creek/Falls is now closed, FYI. May very well still have been open the last time you were there but it’s closed and off limits now. Too many hiker rescues from slip/trip/falls. I think it’s patrolled and enforced to some degree too.
As far as the Lehigh proper, my experience is it’s uncrossable in most places at nearly all flows. Even at 200 cfs it’s lifted me off my feet trying to cross in the tailouts of pools. Be very careful and pick your spots. At current flows (900 cfs or so out of the dam), it’s not crossable anywhere, period. May be some spots at that flow that you can poke around and fish from one bank, but even that will be dicey. I wouldn’t try it personally at that flow and this time of year with water temps. Toughest river to wade in PA IMO. Gradient is very deceiving in the Gorge section.