I am still struggling with fishing 'big rivers', but some things I'm starting to 'think' (figure out is a stretch).
1. there's a key current flow that really concentrates the bait/predators into smaller areas and they're usually 'on the feed'.
2. current breaks (rocks, trees, docks, etc) with eddie pools are where I concentrate. some topwater, but smaller bodied medium depth crankbaits (diggers, rapala DTs, norman DLNs) with some brighter colors get bit. they keep moving.
3. river fish in current don't get the luxury to study their food. they either hit it or it's gone/by them.
I like fishing lighter weights, usually 1/8 to 3/16...but in heavy current here (40K cubic feet per second) I'm up to 3/8 - 1/2 and pegging it. for the flip/pitch.
also, look at that KVD 1/5 in yellow with black back. in heavy flow, there are a lot of fish tight to shoreline
lastly: don't overlook jerkbaits now. and am assuming you have a 3.25 inch swimbait tied on 'a lot'?
so there's some free ideas that are probably worth exactly what you paid for them.