Try this link for Big Manistee conditions, fly patterns and what's hot. http://www.schmidtoutfitters.com/fly_recipes.htm
All my books are in shipment right now, so can't give you a pattern. You might also want to try this bulletin board, a fly fishing board for the Big Manistee area. http://www.flyfishingconnection.com/forums/list/23/
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I am looking for an articulated hexegenia nymph pattern and or a marabou hexegenia nymph to tie for an upcoming trip to the Big Manistee.