LAM,
I've never fished the Genesee in PA, but know well where they are. I believe there are three branches, east, west and middle. They come together in the very small town of Genesee PA to form the main river which travels into NY. The fishing from PA into NY is very good, especially in the Shongo, NY area, but the NO KILL starts at the bridge in Shongo, traveling north 2.5 miles. There's some very nice water there, but be cautious, there are Timber Rattlers around in PA In Potter County.
Konchu,
My experience with the hatches are good. We have a very good Ephemerella dorothea hatch the end of May. We have NO Quill Gordon hatch that I'm aware of, but good olive (Baetis) hatches in the spring. Also some really good Isonychia hatches if the water doesn't get too low and warm in the later season. The Genny is plagued by low water and warm temps. Despite this we have a very good hold over rate, and as I said earlier, the river is open to fishing all year long for trout. The tribs close down at the end of the regular season, which is now October 15. The limit is 5 trout per day on the river with only two fish out of the five allowed over 12", but since I fly fish, that doesn't really matter much.
I have lived in Wellsville 26 years and fished and loved this river emensely. In 1999, I along with a friend, helped start the Upper Genesee River Chapter of TU. We are a small chapter, but we keep a close eye on the river.
Mark
"I have the highest respect for the skilled wet-fly fisherman, as he has mastered an art of very great difficulty." Edward R. Hewitt
Flymphs, Soft-hackles and Spiders: http://www.troutnut.com/libstudio/FS&S/index.html