At higher flows Yarmony rock gets covered and becomes a huge 2/3 river-wide hole. Run it to the left and you should be OK. Scouting it may be a good idea.
Like Dave said, wear PFDs, and take all the standard safety precautions. Don't be complacent just because its Pumphouse.
That said - Have fun!
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse