Reasons For Construction
Early Chicago sewage systems discharged directly into Lake Michigan or into the Chicago River, which itself flowed into the lake. The city's water supply also came from the lake, through water intake cribs located two miles offshore. There were fears that sewage could infiltrate the water supply, leading to typhoid fever, cholera and dysentery. During a tremendous storm in 1885, the rainfall washed refuse from the river far out into the lake (although reports of an 1885 cholera epidemic are untrue), spurring a panic that a future similar storm would cause a huge epidemic in Chicago. The only reason for the storm not causing such a catastrophic event was because the weather was cooler than normal. The Chicago Sanitary District (now The Metropolitan Water Reclamation District) was created by the Illinois legislature in 1889 in response to this close call.
In addition, the canal was built to supplement and ultimately replace the older and smaller Illinois and Michigan Canal (built 1848) as a conduit to the Mississippi River system. In 1871, the old canal had been deepened in an attempt to reverse the river and improve shipping but the reversal of the river only lasted one season. The I&M canal was also badly polluted as a result of unrestricted dumping from city sewers and industries, such as the stockyards.
Read more about this topic: Chicago Sanitary And Ship Canal
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