Featherstone

Definitely a Red-shoulder! The checkerboard pattern on the back as well as the few, thin white bands on the tail are both good indicators. I agree that it looks like a mature bird but it can be hard to tell sometimes with Red-shoulders. There can be a lot of variation with the heads, though, and sometimes you get ones that are really shockingly pale. Just a bit of an outlier.

I concur with the Cooper's Hawk consensus. It's a weird angle but it still appears quite accipitrine in shape to me, not to mention the white undertail coverts and thin banding on tail.

Ferruginous Hawk (photo by Magnus Maske, from Flickr)

California Condor (photo's from Audubon)