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1900

Chicago Sanitary and Ship Canal
Society: ASCEMain Category: CivilSub Category: Water Supply & ControlEra: 1900sDateCreated: 1900The Chicago RiverChicagoState: ILCountry: USAWebsite: http://www.asce.org/project/reversal-of-the-chicago-river/

Until 1900, the Chicago River drained into Lake Michigan, along with all the sewage from the city; and the Des Plaines River west of Chicago emptied into the Illinois River, which eventually flows to the Mississippi. Chicago residents drew their drinking water from polluted areas of the lake near the mouth of the Chicago River, leading to outbreaks of typhoid and other waterborne diseases. 

Image Credit: Courtesy F. E. COMPTON AND COMPANY, 1914 (PD-US-1923) (CC BY-SA 3.0)Image Caption: Chicago Sanitary and Ship Canal (at the time named the Chicago Drainage Canal)
Stevens Pass Railroad Tunnels & Switchback System
Society: ASCEMain Category: CivilSub Category: Rail TransportationEra: 1900-1909DateCreated: 1900Stevens PassState: WAZip: 98826Country: USAWebsite: http://www.asce.org/project/stevens-pass-railroad-tunnels/Creator: Stevens, John F.

In the years following the Civil War, the land west of the Mississippi River was being settled and the Pacific Northwest explored. There remained, however, a large portion of Montana, Idaho, and Washington that contained enormous quantities of timber and minerals, but was not accessible by rail. By far the most grueling stretch was the Stevens Pass area in the Cascade Mountains.

YearAdded:
1993
Image Credit: Courtesy Wikipedia/SeattleretroImage Caption: Railroad development in Stevens Pass made accessible a timber and mineral rich region of Montana, Idaho, and Washington.Era_date_from: 1900
White Pass & Yukon Railroad
Society: ASCEMain Category: CivilSub Category: Roads & RailsEra: 1900-1909DateCreated: 1900WhitehorseState: YukonCountry: CanadaWebsite: http://www.asce.org/project/white-pass-and-yukon-railroad/Creator: Brackett, George

Combining British financing, American engineering, and Canadian contracting, the White Pass and Yukon was the first major civil engineering project on the continent above the 60th degree of northern latitude. Completed in 27 months using only hand tools, black powder, and regional timber, the White Pass and Yukon rises almost 2,900 feet from sea level at the port of Skagway to the White Pass summit on the U.S.-Canada border in just 20 miles, accomplishing one of the steepest climbs of any railroad in the world.

YearAdded:
1994
Image Credit: Courtesy Wikipedia/Klanda (CC BY-SA 3.0)Image Caption: White Pass & Yukon RailroadEra_date_from: 1900
Peavey-Haglin Concrete Grain Elevator
Society: ASCEMain Category: CivilSub Category: BuildingsEra: 1900-1909DateCreated: 19005505 Minnesota 7 Service RdSt. Louis ParkState: MNZip: 55416Country: USAWebsite: http://www.asce.org/project/peavy-haglin-concrete-grain-elevator/Creator: Peavy, Frank , Haglin, Charles

No image dominates the Midwestern landscape like the monolithic grain elevator, whose present shape and construction owe much to grain company operator Frank Peavy and architect-builder Charles Haglin.

Wanting to improve on the flammability and cost of traditional wood-cribbed construction, Peavy speculated that reinforced concrete, in its infancy at the turn of the century, would outperform other materials. But critics feared that the elevator would collapse due to the vacuum created when grain was emptied from the air-tight structure.

YearAdded:
1983
Image Credit: Courtesy Wikipedia/Original Uploader was Elkman (CC BY-SA 3.0)Image Caption: Peavey-Haglin Concrete Grain ElevatorEra_date_from: 1900
Discovery of Organic Free Radicals by Moses Gomberg
Society: ACSMain Category: ChemicalSub Category: Frontiers of KnowledgeEra: 1900-1909DateCreated: 1900University Of MichiganAnn ArborState: MICountry: USAWebsite: https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/freeradicals.htmlCreator: Gomberg, Moses

In 1900, Moses Gomberg, Professor of Chemistry at the University of Michigan, confirmed the existence of a stable, trivalent organic free radical: triphenylmethyl. In so doing, he challenged the then prevailing belief that carbon could have only four chemical bonds. Gomberg’s discovery made a major contribution to theoretical organic chemistry and fostered a field of research that continues to grow and expand. Today, organic free radicals are widely used in plastics and rubber manufacture, as well as medicine, agriculture and biochemistry.

YearAdded:
2000
Image Credit: Public Domain (Copyright Exp.)Image Caption: Discovery of Organic Free Radicals by Moses GombergEra_date_from: 1900
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