I saw a hawk, eagle or falcon...?

And I don't know what species it is! I'd really like to know more about it, because I've never seen that sort of bird of prey around this area before. I live in the Tri-Cities, specifically Richland, in Washington state. We're actually pretty arid around here, especially in comparison to the rest of the state, but there's a small creek outside my workplace. I saw this bird swoop down to where I couldn't see it, and come back with a fish hooked in its talons. I would say it was of middling size- it didn't strike me as a huge bird, but it definitely wasn't small- and the only distinguishing feature I can remember is that it had a light head with darker stripes that might have been near its eyes. It all happened in a flash, so I'm sorry I couldn't give more detail, but does anyone know of a bird of prey in this area that might fit that description?