I have hunted the area a lot in the last few years. I have never flushed any grouse on the East side of RT 209. I have had good luck with pheasant and woodcock there. All the grouse I find on the West side of RT 209 and up in the Delaware state forest. I hope this helps.
2 areas you might want to try if you can find them both sides of big egypt rd. you have to come in off old milford rd .some ponds in there, pretty when the leaves change,beaver swamp on the other side for woodcock.chestnut ridge rd. down towards dingmans ferry,has some old trials in the woods.i used to find them in those 2 places afew years ago.i hunt farther north now.