I am very habitat oriented and the roughly 1.5 mi stretch that I typically fish has much better habitat on average than many of the other stretches that are stocked. That is one reason why I am typically fishing in the more urbanized Whitehall Twsp rather than the suburban and rural areas upstream. Despite high fishing pressure earlier in the season, there are always fish in the good habitat and I doubt that my catch rates in DH areas, for example, would be any better.
Regarding Hopback's comment and the suspicion that there may be wild trout somewhere in that stream, a fishable wild BT pop exists in Allentown within the last mile of the stream, owing its presence to a spring according to those who were on the survey.
As for yeaterday's fishing, I also ran into a pair of Sea Lampreys building a redd. They are fascinating and build substantial structures of cobble. I found that one by tripping over it. Their restoration to the Lehigh and tribs is occurring due to fishways on the lower Lehigh dams and dam removals on the tribs. Multiple dams were removed from the Jordan in the past five years. Note, sea lampreys are a natural part of the Delaware Basin so they are not a problem. They have co-evolved with the other species,in the basin. This is in contrast to the great lakes, where they were introduced.