Todd, you'll be looking to do the Polar Bear section. It's only 3km long. The first 1.8km is continuous CIII-III+ eddie hopping, boulder and hole dodging. Then you get 1km flat water. It finishes with a fun, fair sized CIV rapid you can scout from the highway bridge at the takeout. The last rapid runs between 2 Scandinavian style spas on each side of the river. At high water the first section may bump up to CIV with bigger holes, but that wasn't the case while I've run it.
Google "Polar Bear's Spa" at 930 Boulevard des Laurentides, Piedmont, QC J0R 1K0, Canada. That's the takeout (the 117 highway bridge). Just follow Simon River road up about 4km until it it splits to the right. You'll hit a bridge with flat water before it, and a rapid right under/after it. That's the put in.