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Callosamia promethea
The Cecropia Moth (Hyalophora cecropia) is North America's largest native moth. It is a member of the Saturniidae family, or giant silk moths. Females with a wingspan of 160 mm or more have been documented. It is found as far west as the Rocky Mountains and north into the maritime provinces of Canada. The larvae of these moths are most commonly found on Maple trees, but they have been known to feed on Wild Cherry and Birch trees among many others.
There are three species of Callosamia, however, only promethea occurs in your area.
Compare your pic with this one.
C. promethea: http://bugguide.net/node/view/453552/bgi...
Compare with Hyalophora cecropia:
INFO: http://bugguide.net/node/view/4625
PIC's: http://bugguide.net/node/view/4625/bgima...
Wow- I didn't know you could find those this far north. I'll have to keep my eyes open!