Igquick is your guy! He literally knows how to catch a carp in any condition during any time of year. I would try Kelley point park at the slough, or Vancouver lake , mostly all sloughs that enter Willamette or Columbia river will have carp, look for deeper spots. I fished sellwood park a long time ago during the winter and had luck for carp on worms, Just right off the dock, but there's a lot of people there.