The Chicago Area Waterway System (CAWS) is a complex of natural and artificial waterways extending through much of the

Chicago metropolitan area The Chicago metropolitan area, also colloquially referred to as Chicagoland, is a metropolitan area in the Midwestern United States. Encompassing 10,286 sq mi (28,120 km2), the metropolitan area includes the city of Chicago, its suburbs and hi ...

, covering approximately 87 miles altogether. It straddles the

Chicago Portage The Chicago Portage was an ancient portage that connected the Great Lakes waterway system with the Mississippi River system. Connecting these two great water trails meant comparatively easy access from the mouth of the St Lawrence River on the Atl ...

and is the sole navigable inland link between the

Great Lakes The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes in the mid-east region of North America that connect to the Atlantic Ocean via the Saint Lawrence River. There are five la ...

and the

Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it ...

and makes up the northern end of the

Illinois Waterway The Illinois Waterway system consists of of navigable water from the mouth of the Calumet River at Chicago to the mouth of the Illinois River at Grafton, Illinois. Based primarily on the Illinois River, it is a system of rivers, lakes, and cana ...

. The CAWS includes various branches of the

Chicago (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = List of sovereign states, Count ...

and

Calumet River The Calumet River is a system of heavily industrialized rivers and canals in the region between the south side of Chicago, Illinois, and the city of Gary, Indiana. Historically, the Little Calumet River and the Grand Calumet River were one, the ...

s, as well as other channels such as the

North Shore Channel The North Shore Channel is a drainage canal built between 1907 and 1910 to flush the sewage-filled North Branch of the Chicago River down the Chicago Sanitary and Ship Canal. The sewage carrying duty has been largely taken over by the Chicago D ...

, Cal Sag Channel, and Chicago Sanitary & Ship Canal. The CAWS ends near the Lockport Navigational Pool, the highest elevated of the eight pools of the Illinois Waterway. There are three major locks within the CAWS, operated by the Army Corps of Engineers: the Chicago Harbor Lock, the Lockport Lock & Dam, and the

T.J. O'Brien Lock and Dam Thomas J. O'Brien Lock & Dam is a stop lock in the Hegewisch neighborhood on the South Side of Chicago at the confluence of the Grand Calumet River and Little Calumet River, which form the Calumet River. It is a component of the Chicago Area Wate ...

. Artificial waterways connecting the Mississippi and Great Lakes systems via the Chicago area, over the Chicago Portage, began with the I&M Canal in 1848. The CAWS as it exists today began to take shape in 1900, with the construction of the Chicago Sanitary & Ship Canal to reverse the flow of the Chicago River (and eventually the Calumet River), which previously flowed into

Lake Michigan Lake Michigan is one of the five Great Lakes of North America. It is the second-largest of the Great Lakes by volume () and the third-largest by surface area (), after Lake Superior and Lake Huron. To the east, its basin is conjoined with that ...

, so as to instead flow toward the Mississippi River, thus carrying

sewage Sewage (or domestic sewage, domestic wastewater, municipal wastewater) is a type of wastewater that is produced by a community of people. It is typically transported through a sewer system. Sewage consists of wastewater discharged from residenc ...

away from the City of Chicago. Thereafter, additional artificial waterways were built that became part of the CAWS, such as the North Shore Channel, which runs inland from

Wilmette Wilmette is a village in New Trier Township, Cook County, Illinois, United States. Bordering Lake Michigan and Evanston, Illinois, it is located north of Chicago's downtown district. Wilmette had a population of 27,087 at the 2010 census. The f ...

to the Chicago River and was constructed in 1910, and the Cal Sag Channel, which provides a direct path from the Calumet River to the Illinois Waterway and was finished in 1922. In the 21st century, a focus of concern around the CAWS has been its potential role as a corridor for Asian carp to enter Lake Michigan. Suits in district court and before the

United States Supreme Court The Supreme Court of the United States (SCOTUS) is the highest court in the federal judiciary of the United States. It has ultimate appellate jurisdiction over all U.S. federal court cases, and over state court cases that involve a point ...

have been unable to obtain an injunction requiring the connection between the CAWS and the Mississippi drainage to be closed.

List of waterways

Waterways within the CAWS include: *

Cal-Sag Channel The Calumet River is a system of heavily industrialized rivers and canals in the region between the south side of Chicago, Illinois, and the city of Gary, Indiana. Historically, the Little Calumet River and the Grand Calumet River were one, the ...

Chicago River The Chicago River is a system of rivers and canals with a combined length of that runs through the city of Chicago, including its center (the Chicago Loop). Though not especially long, the river is notable because it is one of the reasons for ...

* Chicago Sanitary & Ship Canal *

Grand Calumet River The Grand Calumet River is a river that flows primarily into Lake Michigan. Originating in Miller Beach in Gary, it flows through the cities of Gary, East Chicago and Hammond, as well as Calumet City and Burnham on the Illinois side. The major ...

(partial) *

Little Calumet River The Calumet River is a system of heavily industrialized rivers and canals in the region between the south side of Chicago, Illinois, and the city of Gary, Indiana. Historically, the Little Calumet River and the Grand Calumet River were one, the ...

(partial) *

References

External links

MWRD - Chicago Area Waterway SystemEPA - Chicago Area Waterway System / Chicago River
{{coord, 41, 42, N, 87, 57, W, region:US-IL_scale:250000, display=title Canals in Illinois Canals in Indiana Geography of Chicago Illinois waterways