Took us about 4 hours of mostly leisurely paddling. Great views. Ran into 1 blockage and 1 dam along the way. There's a lot of bridges to pass under so you should check the water level online before committing to going down the Des Plaines. The only issue we had was navigating over/through a downed tree/logs, but it seemed like you could portage there easily enough.
River/Creek (Up to Class II)