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Buteo jamaicensis
Large hawk reminiscent of a red-tailed hawk but without the distinctive reddish coloration in the tail feathers. Seen along the Columbia River near Hood River, Oregon.
I don't see anything on this bird that would lead you to think it's a merlin or a harrier
Thanks to all who identified this as a juvenile red-tailed hawk. You can see these photos and others of mostly Pacific Northwest wildlife posted at: https://www.flickr.com/photos/ndomer73/.
I would've said Merlin or Northern Harrier, but looking at the tail and size, yeah it's a juvenile red tail.