I am certainly no expert on raptors, Robert, but it looks to me like some color morph of red-tailed hawk.
thanks Shalu. over at FM I've gotten one suggestion it is a Red-shouldered variant.
Not what I want to hear! I want someone to say it is a Sharp-skinned! That'd be a new one for me
So I googled images of immature Red-tailed hawks and Shalu I think you are on target!