Interesting juvenile accipiter!
The head is smallish and rounded, the bill is smallish, the legs are on the thin and small side, and the "expression" is gentle (for an accipiter). All those factors indicate Sharp-shinned Hawk.
However... no supercilium, or maybe just a hint of a tawny one, which are usually Cooper's Hawk characteristics... and while the density and thickness of the upper streaks are good for Sharpie, the flank and belly plumage is essentially unbarred, which is another Cooper's characteristic.
There is an almost complete overlap on plumage with juveniles, and structure trumps plumage, so I will vote for juvenile Accipiter striatus velox (Sharpie). Don't suppose you have any other photos, particularly ones showing the tail?