I am a Scottish fisherman usually fish the Spey which is the fastest flowing river in Britain. I always use a wading stick traditionaly made by the Ghillie. Harness, rubber foot heavily weighted with lead.
Designed so when you let it go iy lies flat so it doesn't catch your line.
Advantages Allows deep wading in heavy water to cover salmon which are normally out of reach.
How deep do I wade ? Till I can cover as many fish as possible, yes I do wear a life jacket.