Below Coliseum is a smaller rapid known as Dog's Leg that serves up some good play at various levels. The rapid is divided into more than one channel by a ridge of rock, creating several routes through it. The most common route is to run the right-hand chute around to the left, past an interesting playhole named Puppy Chow. It's a bit steep for blasting, but shorter boats can have fun with it. Another route is to run the Center Slot, an ugly pourover which is blast-able for those with stout hearts and high pain tolerances (the rocks on either side are sharp and prominent).

Below Dog's Leg there is a stretch of flattish water with a few swirlies in the current to play with, and a splattable rock shelf in mid stream that has an excellent seam coming off the right side - good potential for downtime here. A short drop follows into the last rapid on the Main Channel, Farmer Black's. There is a hole at the top of this rapid that is deceptively benign-looking. It's not dangerously retentive by any means, but it does have stopping power - more so than it's low, slide-type character would imply. It's a stellar blasting venue at lower levels, and the long eddylines that follow further down can be a great place to wind up the day with some extended cartwheeling and past-vertical work (if you've got the energy). Talented boaters can even achieve downtime here, especially in mush-mode. Moving downstream from Farmer Black's, there is a long section of very little gradient known as Hell's Half Mile that has a lot of sublime little mush-move and (occasionally) splat/swipe spots that keep one entertained until a deep, secluded bay appears on the right. This is the takeout for River Run Paddling Centre, and the end of the run down the Main Channel of the Ottawa River.