At this level, 60/40 Falls is Class III+, The Slide is Class IV, and S-turn is Class IV+.
A river-wide ledge forms a 10-foot vertical drop on river left-- the most frequently run part of Pedernales Falls. It is called 60/40 Falls because it’s a very difficult drop to execute perfectly (i.e. you have a 60/40 chance of actually styling it.) The good news is that screw-ups are low-consequence.
Typical line: Aim for the boof flake just right of center on the vertical portion of this drop. It’s tempting to go far river left, but there is a shallow rock shelf at the base of the falls on this side, creating a likely piton hazard.
Creek line (sneak): At 500 cfs and above, the far river right line can be run over a series of small ledge drops.
The sloping drop on center right (between the typical line and the creek line) is a known pin/piton hazard and has handed an injury to at least one expert kayaker.
This rapid becomes more of a Class III at lower levels (< 200 cfs) and more of a Class IV at high levels (> 800 cfs.)