Christian, you have the correct link. That gauge is new as of last year and does not the same level readings you may read about on olders posting about levels on that river. We ran it at 4.5 on the new gauge. Talking to a local boater, that corresponds to 3 ft on the old gauge, which was medium, medicum to low Class III (if you factor in temps and lack of recovery pools, maybe III+). 5 ft on the new gauge would be optimal. Going over 6ft would be epic, my guess, like the Rouge at really high water, monstrous roller coaster wave trains and some gargantuan holes. This is a continuous run and at really high water would be a IV-V run. But at a medium level, with a group, perfect intermediate run. In 10 miles there was 100 yards of flatwater. There are very few eddies. This river drains the Tug Hill Plateau. It's called "flashy" - quick ups and downs, hard to catch. The local we paddled with, Pierre, told me that a good day and half rain in the summer makes it an awesome summer run because it drains a big watershed and about 12 hours later, for one day its awesome, then it disappears and is too low again.
The put in and take out is incredibly user friendly, stairs at both put-in and take out. You put in on moving water, you take-out in moving water. Locals just show up and surf the take-out waves after work because those waves alone are awesome.
Reminder: If you do the full run, eddy out river left in the calm pool above the dam, there is a building with a gravel beach (its about half way in the run). The dam is unrunnable. I've never seen a scarier terminal dam in my life. At the base of the dam, they excavated a U into the river bed, creating a riverwide recirc to make sure all the water recirculates and slows down before going downstream, something about miminmizing erosion below the dam. Its a river wide keeper recirc.
The rest of the river, though, will leave you with a perma grin thinking "this is unreal!" Trust me, keep this in your sights for sure and if you see the gauge go over 4.4, get your butt and playboat down there quick!