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 The Chicago River is a river that runs 156 miles (251 km)[1] and flows through Chicago, including the downtown. Though not especially long, the river is notable for the 19th century civil engineering feats that directed its flow south, away from Lake Michigan, into which it previously emptied, and towards the Mississippi River basin. This was done for reasons of sanitation. The river is also noted for the local custom of dyeing it green to commemorate St. Patrick's Day.
[edit] GeographyOriginally, the river flowed into Lake Michigan. Its course jogged southward from the present river to avoid a baymouth bar, entering the lake at about the level of present day Madison Street.[2] Today, the Main Stem of the Chicago River flows due west from Lake Michigan, past the Wrigley Building and the Merchandise Mart to Kinzie Street, where it meets the North Branch of the river. The North Branch is formed by 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. From downtown, the river flows south along the South Branch, and into the Illinois and Michigan Canal and Chicago Sanitary and Ship Canal. From there, the water flows into the Des Plaines River and eventually reaches the Gulf of Mexico. [edit] History[edit] Early non-Native American settlersJean Baptiste Pointe du Sable, the Founder of Chicago, was the first non-Native American to establish a permanent residence near the Chicago River. He built his farm on the northern bank at the mouth of the river in the 1780s.[3] In 1808, Fort Dearborn was constructed on the opposite bank on the site of the present-day Michigan Avenue Bridge.[4] At one time, and as late as 1830, the north branch of today's Chicago River was known locally as Guarie’s (or Gary's) River. Guarie is a phonetic spelling of the name of an early settler/trader by the name of Guillory, who lived along the Chicago river sometime around 1778.[5] [edit] Early improvementsIn the 1830s and 1840s, considerable effort was made to cut a channel through the sandbar to improve shipping.[2] In 1900, the river's flow was reversed in order to keep Lake Michigan clean. In 1928, the South Branch of the Chicago River between Polk and 18th Street was straightened and moved 1⁄4 miles (0.40 km) west to make room for a railroad terminal. [edit] Reversing the flow Originally, the river flowed into Lake Michigan. As Chicago grew, this allowed sewage and other pollution into the clean-water source for the city. This contributed to several public health problems, including some problems with typhoid.[6] Starting in the 1850s, much of the flow was diverted across the Chicago Portage into the Illinois and Michigan Canal.[7] 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. 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.[8] All outflows from the Great Lakes Basin are regulated by the joint U.S.-Canadian Great Lakes Commission, and the outflow through the Chicago River is set under a U.S. Supreme Court decision (1967, modified 1980 and 1997). The city of Chicago is allowed to remove 3200 cubic feet per second (91 m³/s) of water from the Great Lakes system; about half of this, 1 billion US gallons a day (44 m³/s), is sent down the Chicago River, while the rest is used for drinking water.[9] In late 2005, the Chicago-based Alliance for the Great Lakes proposed re-separating the Great Lakes and Mississippi River basins to address such ecological concerns as the spread of invasive species.[10] [edit] Eastland disasterIn 1915, the Eastland, an excursion boat docked at the Clark Street bridge, rolled over, killing 844 passengers.[11] [edit] Chicago FloodOn April 13, 1992, the Chicago Flood occurred when a pile driven into the riverbed caused stress fractures in the wall of a 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. [edit] EcologyThe 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 freshwater fish are known to inhabit the river, including largemouth and smallmouth bass, rock bass, crappie, bluegill, catfish, and carp. The river also has a large population of crayfish. The South Fork of the Main (South) Branch, which was the primary sewer for the Union Stock Yards and the meatpacking industry, was once so polluted that it became known as Bubbly Creek.[12] 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 inches long.[13] 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.[14] Despite the pollution concerns, the Chicago River remains a very popular target for freshwater recreational fishing. In 2006, the Chicago Park District started the annual "Mayor Daley's Chicago River Fishing Festival", which has increased in popularity with each year.  [edit] St. Patrick's Day As part of a more than forty year old Chicago tradition, the Chicago River is dyed green in observance of St. Patrick's Day.[15] The actual event does not necessarily occur on St. Patrick's Day and is scheduled for the Saturday of the closest weekend. For example in 2009, the river was dyed on Saturday, March 14, 2009, whereas St. Patrick's day was on Tuesday, March 17, 2009. Bill King, the administrator of Chicago's St. Patrick's Day committee, stated that "the idea of dyeing the Chicago River green originally came about by accident when a group of plumbers were using fluorescein dye to trace illegal substances that were polluting the river".[16] The United States Environmental Protection Agency (EPA) outlawed the use of fluorescein for this purpose, since it was proven to be harmful to the river.[16] The secret ingredients used to dye the river green today are claimed to be safe and not harmful to the thousands of living organisms that find a habitat in the Chicago River.[16] In 2009, in keeping with the Chicago St. Patrick's Day tradition, at the request of First Lady Michelle Obama, who is a Chicago native, the White House fountains were dyed green to celebrate St. Patrick's Day.[17] [edit] Bridges  The first bridge across the Chicago River was constructed over the north branch near the present day Kinzie Street in 1832. A second bridge, over the south branch near Randolph Street, was added in 1833.[18] The first movable bridge was constructed across the main stem at Dearborn Street in 1834.[19] Today, the Chicago River has 38 movable bridges spanning it, down from a peak of 52 bridges.[20] These bridges are of 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:
Other bridges:
[edit] Famous buildings Many of Chicago's landmark buildings line the banks of the river. A partial list follows: [edit] Main branch
[edit] South branch
[edit] See also[edit] References
[edit] External links
Coordinates: 41°53′11″N 87°38′16″W / 41.88634°N 87.63764°W | |||||||||||||||||||||||||||||||||||
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