This is an estimate and needs to be worked out. Both the low and high end are SWAGs. Will update as more information comes available.
This low-head dam should be portaged. It's not a big drop, however (as with most man-made structures) the boil-line is very uniform. It has been run EXTREME river right, along the right bank where there is a break in the dam. However, if you go over in the wrong spot, or fail to punch through and paddle out, you will be caught in the recirculation!
Be safe and walk it!