I'm guessing slate drake. I don't know what a grey drake is - probably the same thing. A slate drake, aka Isonychia, does live in Shenandoah, although curiously it is not all that common around the region. It needs really clean water to survive, I've read. Isonychia is a cool bug though because it is a mayfly that acts like a stonefly in that it is a predator. However, unlike stoneflies, Isonychia is a swimmer and not a crawler, so fish regularly see them swimming through the water column. They make wet fly fishing very productive in the streams where they reside. They also have two broods a year, which would explain why this one was out in February. The duns are about the size you describe - big. Check out this classic video from Tight Lines Productions. Isonychia makes an appearance at the 2:30 mark.
-- http://www.tpfr.org
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