This is a classic whitewater day trip in the history of the WCA that I'm looking forward to exploring for the first time. It's a very nice pool & drop river where all the rapids are obvious and there are portage trails along them. The rapids range in difficulty and there are some very challenging rapids and chutes, so you can make the trip as easy or hard as you want by choosing which rapids to run vs portage. It's 16 km but a long day as a result of all the scouting and portaging, so expect to spend around 6 hours on the river.
Update 04/28: there is no online gauge for the Mississagua but recent water management updates suggest that the flows will remain high. There will be some unrunnable rapids with many frequent portages, so try to pack efficiently to transition quickly from paddling to portaging, and be prepared to tackle a few longer portages as well.
