Ridgefield - Mystery Raptor

Does anyone know what species of bird this is? Size reminds me of a Red-tail, but I don't honestly see any red in the tail;  breast is mottled like a Cooper's, but my memory says it wasn't that small a bird.  Red-shouldered Hawk, perhaps?  Admittedly, the lighting is bad; s/he probably wasn't going to let me get out of the car and venture across the field to get a better look :)

Photo was taken at the 9th Street entrance to the River S Auto route at Ridgefield on Tuesday afternoon...

LATER: At the moment, the ID for this bird is vascillating between Red-shouldered and Red-tailed, the vote being split almost 50-50...