Willamette Valley bird

Hello, all. I saw a bird recently on the Willamette River and we're having trouble IDing him. He was a very dark grey and was drinking from the water. He had a distinctive tail flick. Any help would be great.

Thank.

I went to cornell birding, and I'm thinking gray catbird. Let's see what Resin thinks.

Female Brewer's Blackbird.

No Catbirds in western Oregon!

Resin

I looked at the Brewer's Blackbird, and it didn't match! I always forget the females are in disguise! Thanks Resin.

Thanks, everyone. You guys are awesome.