Anything thing above 900cfs on the Dumont section gets tough the holes are very sticky, especially Phoenix. I run it commercially and both of our 14' boats on Friday got surfed in the bottom hole in Phoenix and if you have trouble there you are right into another class IV rapid Deliverance. The rest of the rapids on that section are pretty straight forward. All the swims in Clear Creek out tough and there are very few places to catch an eddy at these flows. Also over 1000cfs the pipe just after Chicago Creek is not passable and the bridge at town park is also to low. We ran it today and just got under it at 900cfs. Be safe Clear Creek is no joke! It is very different from the Ark.