The Presumpscot River in Maine flows approximately 26 miles from its origin at Sebago Lake to Casco Bay. This historically significant waterway, whose name means many falls or river of many rough places in Native American language, has been dramatically altered over centuries of development. Once a fast-flowing river with numerous falls and rapids supporting robust runs of Atlantic salmon, shad, and alewives, today approximately 22 miles of the river are impounded by a series of dams. These changes have transformed the river's ecology from primarily coldwater habitat to a series of warmer impoundments. Despite these alterations, the river still supports diverse fishing opportunities, ranging from stocked trout and salmon fisheries in the Eel Weir Bypass section near Sebago Lake to bass and panfish throughout the impoundments. Recent water quality improvements and the removal of the Smelt Hill Dam at the head of tide have enhanced fishing prospects, particularly in the lower river where migratory fish are beginning to return.