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Chicago Sanitary and Ship Canal
Society: ASCE Main Category: Civil Sub Category: Water Supply & Control Era: 1900s DateCreated: 1900 The Chicago River Chicago State: IL Zip: Country: USA Website: Creator:

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) Era_date_from:
Stevens Pass Railroad Tunnels & Switchback System
Society: ASCE Main Category: Civil Sub Category: Rail Transportation Era: 1900-1909 DateCreated: 1900 Stevens Pass State: WA Zip: 98826 Country: USA Website: 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.

Image Credit: Courtesy Wikipedia/Seattleretro Image 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: ASCE Main Category: Civil Sub Category: Roads & Rails Era: 1900-1909 DateCreated: 1900 Whitehorse State: Yukon Zip: Country: Canada Website: 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.

Image Credit: Courtesy Wikipedia/Klanda (CC BY-SA 3.0) Image Caption: White Pass & Yukon Railroad Era_date_from: 1900
Peavey-Haglin Concrete Grain Elevator
Society: ASCE Main Category: Civil Sub Category: Buildings Era: 1900-1909 DateCreated: 1900 5505 Minnesota 7 Service Rd St. Louis Park State: MN Zip: 55416 Country: USA Website: 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.

Image Credit: Courtesy Wikipedia/Original Uploader was Elkman (CC BY-SA 3.0) Image Caption: Peavey-Haglin Concrete Grain Elevator Era_date_from: 1900
Discovery of Organic Free Radicals by Moses Gomberg
Society: ACS Main Category: Chemical Sub Category: Frontiers of Knowledge Era: 1900-1909 DateCreated: 1900 University Of Michigan Ann Arbor State: MI Zip: Country: USA Website: Creator: 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.

Image Credit: Public Domain (Copyright Exp.) Image Caption: Discovery of Organic Free Radicals by Moses Gomberg Era_date_from: 1900
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