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Cistothorus palustris
Seen at Smith and Bybee Lakes, Portland Oregon.
Urban wetland.
Patterning on the mantle and tertials is distinctive. Neither House nor Pacific Wren show this pinnated patterning.
Pacific Wren sightings in the date and location range:
http://tinyurl.com/pacificwrenportland
Time of sighting is wrong for a House Wren. I would have said Winter Wren, but the classifications have changed in the past few years. I think maybe it's a Pacific Wren (Troglodytes pacificus).