I once saw an outfitter's 16' gear boat, mounded with an actual ton of gear to support a family on a multi-day trip to Canon City, and rowed by a small female guide, run the trip at 600 cfs. During the drought in '02 - '04 they were running trips at 300 and 400 cfs, sometimes 250 cfs.
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