As the Erie Lobe retreated to the northeast, it left large debris deposits called moraines running at right angles to its line of retreat.
 One of these, called the Fort Wayne Moraine, was left at the site of present-day Fort Wayne, Indiana, where it acted as a dam that held back the waters of the lake.
  When the water was at its highest point, about 800 feet above sea level (ASL) (244 m), it left beach ridges that later became the routes of trails and highways.
 During this stage, the waters of the lake, possibly in response to an advance of the ice front at the lake's eastern end, overtopped a "sag" in the Fort Wayne Moraine.
 This caused a catastrophic drainage of the lake known as the Maumee Torrent that scoured a one- to two-mile-wide outlet running southwest to the Wabash River known as the Wabash-Erie Channel.
As the Erie Lobe retreated to the northeast, it left large debris deposits called moraines running at right angles to its line of retreat.  One of these, called the Fort Wayne Moraine, was left at the site of present-day Fort Wayne, Indiana, where it acted as a dam that held back the waters of the lake.   When the water was at its highest point, about 800 feet above sea level (ASL) (244 m), it left beach ridges that later became the routes of trails and highways.  During this stage, the waters of the lake, possibly in response to an advance of the ice front at the lake's eastern end, overtopped a "sag" in the Fort Wayne Moraine.  This caused a catastrophic drainage of the lake known as the Maumee Torrent that scoured a one- to two-mile-wide outlet running southwest to the Wabash River known as the Wabash-Erie Channel.
Lake Maumee