Hopefully we get some good sun the next day or 2 to beat down on the surface of the water. I would guess those surface temps might not even be above freezing right now. If you spend any time on the river mid winter a few interesting things you may see are fishing open water with water temps below 32 degrees. Think the lowest I have seen is around the 30 degree mark.
Next is water freezing when its well above 32 degree air temps. In the right conditions as soon as the wind stops blowing or the suns rays go down even if the air temps are well above freezing and the water temps are below the river will start to freeze.
Third is how much cold air the river valley around pool 2 will hold. Watch you vehicle thermometers while at the landings. The closer you are to the water the cooler the temps will be. Think Joel mentioned to me one night this winter about temps close to 32 degrees at the landing and hitting low 40s just a couple of blocks away.
Now if the ramps would open up again soon I could quit sitting at the computer thinking about this stuff and go experience it.