I think the Heritage fly shop in Allentown is there. In White Haven, you might be able to scamper about before Mud Run and Hickory come in. Right off the bridge in White Haven, coming into town off the turnpike(off 940) there is parking past the row of shops by the grocery store. It's called market fresh or something. Then, past White Haven, after crossing over top of 80, you can go down this road named Lehigh Gorge Drive. Go down that until you hit Tannery Road. Parking for about 7 cars is along a bridge, and the trail is right there. Both these areas have bigger pools that they fish may be rising in.
Tan Caddis 12-16 and big March Browns, like a 6-8 have been working. Smaller March browns will work -around a 10 or 12. MB emergers in a rusty spinner color work well too. Sulphurs may be coming out, they like high water. Size 14-16.