Going by the lack of barring or red on the body, no dark shoulder or wrists, that rules out Sharpie, Coopers, Red-Tailed, Red-Shouldered and Rough-legged.
That plus the barring on the tail would make it an adult Harrier.
Juvie Red-Shouldered Hawks should have a translucent crescent near the ends of the wings that would be visible in a shot like this.