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In the full-size photo you can see quite clearly the long wings, large size, and short legs that would make this a Raven over a Crow: http://lh6.ggpht.com/Hcpkx9ak1jl5w0IJmR7...
All American birds in the genus Corvus have black bills. The bill of the American Crow is jet black. I'm actually leaning towards Common Raven here. They're more common in the mapped location and have long wings and short legs like this bird.
Either an American Crow (Corvus brachyrhynchos) or a Common Raven (Corvus corax). I'm not sure if one can distinguish the two from this photo.