Raftus, USFS and BLM consider the Sink a class V at any flow over 3000 (at least that's what the rangers told me) and that wood on the right has been there for several years. You definitely would not ever want to swim the right side of that rapid, could be your last time. Both of the big holes will kick a swimmer out after a few seconds at normal flows but get a little more dicey at flows like we have now. I believe the death toll currently sits at 8 for that rapid.
For folks who have never been you should be advised that the road to the put-in is probably the most dangerous part of the day. Windy, hilly single lane with cliffs on the right and a steep bank with a soft shoulder that drops off into the water on the left. Lots of wrecks in the past and even a few deaths. Drive slow. The river will be there whenever you get there.