lol, yes. Silvery cold water fish = salmon/trout/steelhead.
If you're really set on warm water fish - think smaller, and think slower presentations. One place to try might be Cedar Island Lagoon on the Willamette - IF the bridge is across the canal. Access it from M. S. Young Park in West Linn, hike down to the river, and head down stream, you'll see the foot bridge, if it's there, and you can cross a small canal channel onto Cedar Island, hike through the bushes, and you'll pop out by the lagoon. Lots of warm water fish in there during the warmer months - and makes sense that they'll be in there in the winter. It's pretty sheltered, the bottom is sandy/rocky and sloping.
Then again, if the foot bridge doesn't allow access - you're stuck wading to get to the island, or you can fish around the rocks or hike upstream to a sort of back water upstream of where the trail pops out. Also been known to get some warm water fishes out of that area.
Then you've got places like the Salish Ponds in Gresham, Commonwealth and Bethany Lakes in Beaverton, and a host of other little ponds and back waters along the Willamette and Columbia that hold warm water fish.
Hagg Lake opens next weekend - lots of warm water fishing opportunities there. Lots of state record smallmouth bass out of that lake.
Action just won't be as fast or consistant as it is in the warmer months.