When river fish use snag infested areas, don't fret. Snap-Loc is here. Tie the river rig with a three-way swivel with your line attached to one end in line with a three foot leader and your bait. Run a lighter dropper to a look knot and a Snap-Loc. So you only lose the weight if you hang up. Loop knots also ease weight changes to reduce lost sinkers.
When your hook is on a long leader and you want to be sure it doesn't get hung up on the bottom, just add a small round bobber or cork.