[va-bird] ID help - Burke Lake Raptor?

Hello, I'm new to this list, primarily a nature photographer with a new-found 
interest in birds.
 
I spooked this one while walking down a wooded path at Burke Lake last Saturday 
(March 4) and thought it was a Red-tail hawk due to it's size. When I got home 
and looked at the photos it appeared to be something else, maybe a falcon? 
 
It's not a great picture, but maybe good enough for someone to identify?
http://www.pbase.com/image/57004544
 
Thanks,
 
Sayer 
--------------- 
Sayer's Web: http://sayersweb.com
 

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