The north end (north of the confluence) doesn’t have wingdams. You need to watch the shorelines especially in the low water but you are generally OK even pretty tight to shoreline.
The flow is super slow right now. I’ve been using 1/8th and 1/4th oz jigs in the seams. You don’t need to be vertical – you want the jig slowly sweeping in the current. Sometimes a vertical hold at the bottom of the sweep will get bites but they usually come as the bait sweeps across the current. I spot lock on an edge and jog in and out.
For trolling, I have been going upstream between 1.5-2.0 mph. You want to make bottom contact. If you troll downstream I’d target 2.5-3.5mph again making bottom contact.
Agreed on 50 degrees is kind of the changeover for plastics but the plastics bite is there all the time. You just slow down as the water cools.
I agree – don’t overthink it. Run up by the dam with some live bait and drag it around. There will be other boats up there so you can see what they are doing. Find a current seam on either side of the island and put bait near the bottom. You’ll catch something.
PM me and I can give you a few more specifics if you want them.