The Crooked River is fishing great, like the old days on the river in the winter! BWO hatches remain important although in January and February they can slow up a lot, or altogether stop if the water gets too chilly. Midges will go no matter what unless the river freezes over.
My friend Chester was out there and ran into the exact scenario with the BWO spinners that I described above in the Metolius report and while it was quick, the fish responded to the spinners when that happened.
Euro Nymphing techniques and NZ Wool Indicators will be your best methods, keeping an eye open for short dry fly bursts from about noon to dark and depending on the wind and air temps for dries.