Ausable River (Lake Huron)

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Not to be confused with Au Sable River (Michigan).
Coordinates: 43°14′1.7154″N 81°54′18.9606″W / 43.233809833°N 81.905266833°W / 43.233809833; -81.905266833
Ausable River
River
Name origin: from the French Rivière aux Sables, sandy river
Country Canada
Province Ontario
Counties Perth, Huron, Middlesex, Lambton
Municipalities West Perth, Bluewater, South Huron, North Middlesex, Adelaide–Metcalfe, Lambton Shores
Tributaries
 - left Little AuSable River
Source Staffa
 - location West Perth, Perth County
 - elevation 334 m (1,096 ft)
 - coordinates 43°28′26″N 81°18′54″W / 43.47389°N 81.31500°W / 43.47389; -81.31500
Mouth Lake Huron
 - location Port Franks, Lambton Shores, Lambton County, Ontario
 - elevation 176 m (577 ft)
 - coordinates 43°14′1.7154″N 81°54′18.9606″W / 43.233809833°N 81.905266833°W / 43.233809833; -81.905266833
Location of the mouth of the Ausable River in Ontario.

The Ausable River is a river in southwestern Ontario Canada which empties into Lake Huron at Port Franks, Ontario. The Ausable's initial source is in a moraine near the community of Staffa, Ontario located in the municipality of West Perth, Ontario at a point 334 metres (1,096 ft) above sea level. Although the river has a total measured length of over 240 kilometres (150 mi), because of its meandering course, the mouth in actuality is only 64 kilometres (40 mi) from its source near Staffa. The Ausable drains 1,142 square kilometers (441 sq mi) of land, and falls 158 metres (518 ft) in elevation from source to outlet.

In 1875, engineers of the Canada Company engaged in a large scale drainage project, referred to locally as "The Cut", which altered the course of the river dramatically and permitted the draining of several local small lakes and wetlands for agricultural purposes. Before that time the Ausable passed through the village of Grand Bend, where it made an abrupt curve toward the south, paralleling the Lake Huron shoreline for several kilometers, before entering the lake at Port Franks. This abrupt "bend" in the course of the river, is the origin of the name of the community of Grand Bend. The former course of the river, sections of which almost completely dry up during the summer season, can still be seen in Pinery Provincial Park. It is referred to as the Old Ausable Channel.

The river provides habitat for several endangered freshwater mussel species, several threatened or endangered fish species and the threatened Eastern Spiny Softshell Turtle.

The formation of the Ausable Gorge by the river near Arkona has exposed fossils from the Middle Devonian period. At one time, a hydroelectric plant was located at nearby Rock Glen Falls.

This river was called Rivière aux Sables or "sandy river" by the French which through time became the Aux Sables River in English. The name was condensed to Ausable in the early 20th century.

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