The Iroquois name for the Rochester area is Cas-con-sha-gon, meaning “river with falls upon it." The Genesee River has three waterfalls in Rochester as the river plunges over the Niagara escarpment. Several more waterfalls were formed when streams entered the river gorge. There are smaller waterfalls in the Irondeqoit valley (which was the pre-ice age route of the Genesee river). There are maps and trail descriptions at:
http://www.trails.com/activity.aspx?area=15197