Adequate for main falls and left side of lower falls.
River right of big island is a double drop consisting of two 6' ledges. (This isn't really at 4.2 miles, but after you run river left, you can take-out at the end of the island, portage back to the other end, and run river right.) Flow needs to be over 1,000 cfs to run this -- at flows lower than that, it is just too shallow (you'll 'grunge out' on the approach, and land hard -- boat/body abuse).