[cobirds] bird id help boulder county gross reservoir area

I'm bad with raptors. I'm guessing that it is a juvenile Northern Goshawk.
Raptors I have identified in my backyard are American Kestrels, Sharp shinned Hawks, Bald  Eagles, Redtailed Hawks, Ospreys-- but this one's got me stumped.
Size is larger than a Sharp shinned, but, I think, smaller than a Redtailed.
Any clues greatly appreciated.
BTW it appears to be missing a leg.

--Pieter

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