Chewuch - 2. Camp Four to Five Mile Bridge (The Middle) (WA)
The maximum used to be listed as 1200, but that was for a different gauge estimate. This is still class III at 2000 cfs.
The longest and most challening rapid on the run, Boulder Creek Rapid begins at a pair of old bridge abutments and continues for nearly a mile to the take-out. This section is really a set of several rapids stacked together.
Located at USGS River Mile 9.0.