Not trying to scare you from enjoying the Lehigh or be a know-it-all, but there are a ton of snakes this year. Their favorite place to sun is on those banks with all the rocks, especially amongst the rhododendron.
It is a very tricky place to spot these snakes, because the lighter phases blend in with the leaves that get stuck at the base of rhododendrons and there are still coal seams showing that the blacks sometimes rest on, so take your sun glass off until you hit the water so you can really see where you are walking.
And I am pretty sure I don't get cell service through a lot of the Gorge, so be super careful with snakes and wading. Let someone know you are going down there. The DCNR does drive the bike trail in peak season, but they will not see you in the Gorge, they would have to do a search sweep or hear you if you broke a leg or passed out from a snake bite.
The ticks are not bad down there for some reason.