We fished just below McNary Dam on the Columbia River. Chartreuse and silver were our best worm harnesses (spinners) drug behind bottom walkers. The biggest trick is finding their depth early on. On Friday barometric pressure was near 30-35 and the fish were in 20-25', on saturday it was lower pressure (20) and they were between 50-60', on Sunday it was somewhere in between and we caught 25 in 6 hours under the first pylon (oregon side) under the highway at 20-25' and 35-50'.
The larger fish were caught on plugs after dark on underwater ledges. Just troll your plugs slowly around the underwater hills and you'll get one eventually.