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The Chicago River is 156 miles (251 km) long, and flows through downtown Chicago. In 1900 the river's flow was reversed in order to keep Lake Michigan clean.

Geography

The northernmost branches of the river are the West Fork, the East Fork (a.k.a. Skokie River) and the Middle Fork, which join into the North Branch at Morton Grove, Illinois. The North Branch meets up with the Main Branch of the Chicago River at Kinzie Street in Chicago. The Main Branch flows due West from Lake Michigan, past the Wrigley Building and the Merchandise Mart.

History

In the 1770s, Jean Baptiste Point du Sable built his farm on the northern bank of the river, the first non-Native American settlement of Chicago, and early in the next century, Fort Dearborn was built on the southern bank of the river. In 1915, the Eastland, an excursion boat docked at the Clark Street bridge, rolled over, killing 812 passengers. In 1928, the South Branch of the Chicago River between Polk and 18th Street was straightened and moved 1/4 miles (400 m) west to make room for a railroad terminal.

Reversing the Flow

Originally, the river flowed into Lake Michigan, which allowed sewage and other pollution into the clean-water source for Chicago. This contributed to several public health issues including a major cholera epidemic. In 1871 much of the flow was diverted into the Illinois and Michigan Canal. In 1900, the Sanitary District of Chicago completely reversed the flow of the river using a series of canal locks and caused the river to flow into the newly completed Sanitary and Ship Canal. Before this time the Chicago River was known by many local residents of Chicago as "the stinking river" because of the massive amounts of sewage and pollution which poured into the river from Chicago's booming industrial economy. Up through the 1980s, the river was quite dirty and often filled with garbage; however, during the 1990s, it underwent extensive cleaning as part of an effort at beautification by Chicago Mayor Richard M. Daley.

Chicago Flood

In 1992 the Chicago Flood occurred when a pile driven into the river punctured a hole in the wall of the long abandoned Chicago Freight Subway near Kinzie Street. Most of the 60 mile (97 km) network of underground freight railway, which encompasses much of downtown, was eventually flooded along with the lower levels of buildings it once serviced and attached underground shops and pedestrian ways.

Every year on St. Patrick's Day, the river is dyed green. The Pipefitters Union uses fluorescein dye which can also be used to study moving water. While in 1962, 100 pounds of dye were used, more recently the amount has been decreased to about 40 pounds.

Bridges

The Chicago River has 45 movable bridges spanning it, down from a one-time high of 52 bridges. These bridges include several different types, including trunnion bascule, scherzer rolling lift, swing bridges and vertical lift bridges.

The following bascule bridges cross the river (and its south branch) into the Chicago Loop:

Harrison Street Bridge (1960)
Congress Parkway Bridge (1954)
Van Buren Street Bridge (1956)
Jackson Boulevard Bridge (1916)
Adams Street Bridge (1927)
Monroe Street Bridge (1919)
Madison Street Bridge (1922)
Washington Street Bridge (1913)
Randolph Street Bridge (1984)
Lake Street Bridge (1916)
Franklin Street Bridge (1920)
Wells Street Bridge (1922)
La Salle Street Bridge (1928)
Clark Street Bridge (1929)
Dearborn Street Bridge (1963)
State Street Bridge (1949)
Wabash Avenue Bridge (1930)
Michigan Avenue Bridge (1920)
Columbus Drive Bridge (1982)
Lake Shore Drive Bridge (originally known as the Link Bridge) (1937)

@@ Line 1: / Line 1: @@
 [[Image:Chicago_river_2004.jpg|thumb|300px|Downtown buildings line the Chicago River]]
+The '''Chicago River''' is 156 miles (251 km) long, and flows through downtown [[Chicago]]. In [[1900]] the river's flow was reversed in order to keep [[Lake Michigan]] clean.
-The '''Chicago River''' is a 156 mile (251 km) long [[river]] flowing through downtown [[Chicago, Illinois|Chicago]].  Originally, the river flowed into [[Lake Michigan]], but in [[1871]] much of the flow was diverted into the [[Illinois and Michigan Canal]]. In [[1900]], the Sanitary District of Chicago completely reversed the flow of the river using a series of [[canal lock]]s and caused the river to flow into the newly completed [[Chicago Sanitary and Ship Canal]]. Before this time the Chicago River was known by many local residents of Chicago as "the stinking river" because of the massive amounts of [[sewage]] and [[pollution]] which poured into the river from Chicago's booming industrial economy. Up through the [[1980s]], the river was quite dirty and often filled with [[garbage]]; however, during the [[1990s]], it underwent extensive cleaning as part of an effort at beautification by Chicago Mayor [[Richard M. Daley]].
+== Geography ==
 The northernmost branches of the river are the West Fork, the East Fork (a.k.a. [[Skokie River]]) and the Middle Fork, which join into the North Branch at [[Morton Grove, Illinois]].  The North Branch meets up with the Main Branch of the Chicago River at Kinzie Street in Chicago.  The Main Branch flows due West from Lake Michigan, past the [[Wrigley Building]] and the [[Merchandise Mart]].
+== History ==
-The Chicago River has 45 [[movable bridge]]s spanning it, down from a one-time high of 52 bridges.  These bridges include several different types, including [[trunnion bascule bridge|trunnion bascule]], [[scherzer rolling lift bridge|scherzer rolling lift]], [[swing bridge|swing bridges]] and [[vertical lift bridge|vertical lift bridges]].
+In the [[1770s]], [[Jean Baptiste Point du Sable]] built his farm on the northern bank of the river, the first non-[[Native American]] settlement of Chicago, and early in the next century, [[Fort Dearborn]] was built on the southern bank of the river.  In [[1915]], the ''[[Eastland]],'' an excursion boat docked at the Clark Street bridge, rolled over, killing 812 passengers.  In [[1928]], the South Branch of the Chicago River between Polk and 18th Street was straightened and moved 1/4 miles (400 m) west to make room for a railroad terminal.
+=== Reversing the Flow ===
-In the [[1770s]], [[Jean Baptiste Point du Sable]] built his farm on the northern bank of the river, the first non-[[Native American]] settlement of Chicago, and early in the next century, [[Fort Dearborn]] was built on the southern bank of the river.  In [[1915]], the ''[[Eastland]],'' an excursion boat docked at the Clark Street bridge, rolled over, killing 812 passengers.  In [[1928]], the South Branch of the Chicago River between Polk and 18th Street was straightened and moved one quarter mile (400 m) west to make room for a railroad terminal.
+Originally, the river flowed into [[Lake Michigan]], which allowed sewage and other pollution into the clean-water source for Chicago. This contributed to several [[public health]] issues including a major [[cholera]] epidemic. In [[1871]] much of the flow was diverted into the [[Illinois and Michigan Canal]]. In [[1900]], the Sanitary District of [[Chicago]] completely reversed the flow of the river using a series of [[canal lock]]s and caused the river to flow into the newly completed [[Sanitary and Ship Canal]]. Before this time the Chicago River was known by many local residents of Chicago as "the stinking river" because of the massive amounts of [[sewage]] and [[pollution]] which poured into the river from Chicago's booming industrial economy. Up through the [[1980s]], the river was quite dirty and often filled with [[garbage]]; however, during the [[1990s]], it underwent extensive cleaning as part of an effort at beautification by Chicago Mayor [[Richard M. Daley]].
+=== Chicago Flood ===
 In [[1992]] the [[Chicago Flood]] occurred when a pile driven into the river punctured a hole in the wall of the long abandoned [[Chicago Freight Subway]] near Kinzie Street.  Most of the 60 mile (97 km) network of underground freight railway, which encompasses much of downtown, was eventually flooded along with the lower levels of buildings it once serviced and attached underground shops and pedestrian ways.
+Every year on [[St. Patrick's Day]], the river is dyed green. The Pipefitters Union uses [[fluorescein]] dye which can also be used to study moving water.  While in 1962, 100 pounds of dye were used, more recently the amount has been decreased to about 40 pounds.
-[[Image:Chicago River, dye travelling upstream.jpg|thumb|right|300px|The Chicago River during the [[2005]] [[St. Patrick's Day]] celebration. Some of the dye has traveled upstream.]]
-Ever since [[1962]], the river has been dyed green on St. Patrick's Day. The Pipefitters Union uses [[fluorescein]] dye which can also be used to study moving water.  While in 1962, 100 pounds of dye were used, more recently the amount has been decreased to about 40 pounds.
 ==Bridges==
+The Chicago River has 45 [[movable bridge]]s spanning it, down from a one-time high of 52 bridges.  These bridges include several different types, including [[trunnion bascule bridge|trunnion bascule]], [[scherzer rolling lift bridge|scherzer rolling lift]], [[swing bridge|swing bridges]] and [[vertical lift bridge|vertical lift bridges]].
 The following [[bascule bridge]]s cross the river (and its south branch) into the [[Chicago Loop]]:
 *[[Harrison Street Bridge]] (1960)