Chicago River

The Chicago River is 156 miles (251 km) long, and flows through downtown Chicago, Illinois. The river is not particularly long, but is notable for 19th-century civil engineering feats which directed its flow south, away from the city and towards the Mississippi River basin for sanitation purposes. The river is also noted for being dyed green on St. Patrick's Day.

Geography

The northernmost branches of the river are the West Fork, the East Fork (also known as the 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.

Ecology

The Chicago River has been highly affected by the industrial and residential areas around with attendant changes to the quality of the water and riverbanks. Several species of warmwater fish are known to occur in the river including largemouth and smallmouth bass, rock bass, crappie, bluegill, catfish and carp. The river also has a large population of crayfish. Illinois has issued advisories regarding eating fish from the river due to PCB and mercury contamination, including a "do not eat" advisory for carp more than 12" long.There are concerns that silver carp and bighead carp, now invasive species in the Mississippi and Illinois Rivers may reach the Great Lakes through the Chicago River.[http://www.flmnh.ufl.edu/fish/InNews/leapingcarp2006.html

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 1900 the river's flow was reversed in order to keep Lake Michigan clean. 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 across the Chicago Portage into the Illinois and Michigan Canal. In 1900, the Sanitary District of Chicago, then headed by Rudolph Hering, completely reversed the flow of the river using a series of canal locks 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. Recently, researchers at the University of Illinois at Urbana-Champaign created a three-dimensional, hydrodynamic simulation of the Chicago River, which suggested that density currents are the cause of an observed bi-directional wintertime flow in the river. At the surface, the river flows east to west, away from Lake Michigan, as expected. But deep below, near the riverbed, water travels west to east, toward the lake. ^*

All outflows from the Great Lakes basin are regulated by an joint U.S.-Canadian commission and the outflow through the Chicago River is set under a U.S. Supreme Court decision (1967, modifeid 1980 and 1997). The city of Chicago is allowed to remove 3200 cubic feet per second (cfs) of water from the Great Lakes system, about half of this (1 billion gallons a day) is sent down the Chicago River, while the rest is used for drinking water. In late 2005 the ^* Presumedly this plan would restore the Chicago River's original natural flow.

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 tunnel of the Chicago Tunnel Company 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.

St. Patrick's Day

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 (45 kg) of dye were used, more recently the amount has been decreased to about 40 pounds (18 kg).

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 (Chicago) (1915)
Franklin Street Bridge (1919)
Wells Street Bridge (1922)
La Salle Street Bridge (1928)
Clark Street Bridge (1929)
Dearborn Street Bridge (1962)
State Street Bridge (1948)
Wabash Avenue Bridge (1930)
Michigan Avenue Bridge (1920)
Columbus Drive Bridge (1982)
Lake Shore Drive Bridge (originally known as the Outerlink Drive Bridge) (1936)

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