The Beaverkill is low, as is often the case with end-of-season fishing, and trout will be mainly in the deeper pools. Fortunately we have had cool evenings to help keep water temperatures down.
During the month of September into October Isonychias become an important fly; you may see them crawling out on the rocks in the afternoons.There may be some remaining Trichos in the mornings and Caddis flies and Blue-Winged Olives during the day.
The Dun Variant in size #14 is a preferred fly to use when Isonychias are about. An Elk Hair Caddis in size #14 is a good attractor fly; 5X tippet is sufficient for flies of this size.
Approach the water quietly and carefully and with a minimum of disturbance and make every cast your best, and anticipate a strike once you cast your fly for improved fishing success.