Rosseau Falls consists of two waterfalls as the river descends about 30 m along its route to Lake Rosseau.
Upper Rosseau Falls is very easy to access just off of highway 141, you can park in a small picnic area and a short jaunt across the street and you're there. Lots of great places to sit and enjoy the view, the scenery and the tranquility. Lower Rosseau Falls is about 1km downstream and exits into the mouth of Lake Rosseau, I didn't see if it was possible to hike down to the lower falls, I drove there and there is also a small parking lot.
Most of Lower Rosseau Falls is available to the public but there is a small section down by the final outfall into Lake Rosseau that is on private property.