Lake Shore and Michigan Southern Railway, Bridge No. 6

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Lake Shore and Michigan Southern Railway, Bridge No. 6

Lake Shore and Michigan Southern Railway Bridge No. 6.jpg

Bridge No. 6 in 1999.
Coordinates 41°43′11″N87°32′34″W / 41.71972°N 87.54278°W / 41.71972; -87.54278 Coordinates: 41°43′11″N87°32′34″W / 41.71972°N 87.54278°W / 41.71972; -87.54278
Carries Two tracks per span, four total
Crosses Calumet River
Locale Chicago, Illinois
Maintained by Norfolk Southern Railway
Design Vertical-lift bridge
Material Steel
Width 31 feet (9.4 m) each span [1]
Longest span 209.75 feet (63.9 m) [1]
No. of spans Two parallel
Designer Waddell & Harrington
Constructed by Dravo Contracting Company
Construction start 1912
Construction end 1915

Lake Shore and Michigan Southern Railway, Bridge No. 6 is a steel vertical-lift bridge consisting of two parallel spans, carrying two tracks each, across the Calumet River in Chicago, Illinois, United States. The structure is currently owned by Norfolk Southern Railway but disused and kept in a raised position. [2]

Vertical-lift bridge movable bridge in which a span rises vertically while remaining parallel with the deck

A vertical-lift bridge or just lift bridge is a type of movable bridge in which a span rises vertically while remaining parallel with the deck.

Calumet River river in the United States of America

The Calumet River is a system of heavily industrialized rivers and canals in the region between the neighborhood of South Chicago in Chicago, Illinois, and the city of Gary, Indiana. Historically, the Little Calumet River and the Grand Calumet River were one, the former flowing west from Indiana into Illinois, then turning back east to its mouth at Lake Michigan at Marquette Park in Gary.

United States Federal republic in North America

The United States of America (USA), commonly known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, and various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is slightly smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U.S. is the third most populous country. The capital is Washington, D.C., and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico. The State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean. The U.S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The extremely diverse geography, climate, and wildlife of the United States make it one of the world's 17 megadiverse countries.

The current structure replaces an earlier swing bridge on the same site, built for the Lake Shore and Michigan Southern Railway. When the United States Army Corps of Engineers began calling for its replacement in 1909, both single- and double-leaf bascule bridge options were considered, as well as vertical-lift options. Construction began on foundations for a single, four-track vertical-lift span before changing to the two parallel two-track spans that were completed in 1915. [1]

Swing bridge movable bridge that has a vertical locating pin and support ring about which the turning span can pivot horizontally

A swing bridge is a movable bridge that has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the turning span can then pivot horizontally as shown in the animated illustration to the right. Small swing bridges as found over canals may be pivoted only at one end, opening as would a gate, but require substantial underground structure to support the pivot.

Lake Shore and Michigan Southern Railway

The Lake Shore and Michigan Southern Railway, established in 1833 and sometimes referred to as the Lake Shore, was a major part of the New York Central Railroad's Water Level Route from Buffalo, New York, to Chicago, Illinois, primarily along the south shore of Lake Erie and across northern Indiana. The line's trackage is still used as a major rail transportation corridor and hosts Amtrak passenger trains, with the ownership in 1998 split at Cleveland between CSX to the east, and Norfolk Southern in the west.

United States Army Corps of Engineers federal agency under the Department of Defense and a major Army command

The United States Army Corps of Engineers (USACE) is a U.S. federal agency under the Department of Defense and a major Army command made up of some 37,000 civilian and military personnel, making it one of the world's largest public engineering, design, and construction management agencies. Although generally associated with dams, canals and flood protection in the United States, USACE is involved in a wide range of public works throughout the world. The Corps of Engineers provides outdoor recreation opportunities to the public, and provides 24% of U.S. hydropower capacity.

The bridge was designated as a Chicago landmark on December 12, 2007. [3]

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