Smooth Rock Falls is an incorporated town in the Cochrane District in Northeastern Ontario, Canada, with a population of 1,330 at the 201…Smooth Rock Falls is an incorporated town in the Cochrane District in Northeastern Ontario, Canada, with a population of 1,330 at the 2016 census. The town lies on the Mattagami River and on Highway 11. The next full-service towns in each direction are Cochrane, about 59 km to the east and slightly south by road, and Kapuskasing, about 65 km to the west and slightly north. Highway 634 connects Smooth Rock Falls northward with the railway point of Fraserdale, and Highway 655, starting in Driftwood east of Smooth Rock Falls, provides easier access to Timmins, the dominant regional centre, about 102 km south by that route.