We raft rapids up to grade 4. Anything graded 5 or 6 is inspected from the bank and portaged - the rafts and all the gear are carried around it. That rule applies on every departure, regardless of who is on the trip.
If you have never rafted, the scale means little, so here is what it feels like from inside a raft. Grade 2 is moving water with small waves and an obvious way through, you paddle, you get wet, you are never in doubt. Grade 3 is bigger and busier, with waves breaking over the bow and rocks to steer around; the guide is calling strokes and you are working. Grade 4 is powerful and technical; a drop you have to enter in exactly the right place, where the calls matter and everyone in the raft has to make them together. Grade 5 and above is water we do not run with passengers, which is why we walk around it.
On the Franklin the grade of any given rapid changes with the water level, so the guides read the river on the day rather than working from a fixed list.
"Challenged? Yes. Safe? Always." - Roger Davis, Franklin River, March 2022