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File:LOCKS - GENERAL PLAN Drawing No. M-L 26 22-1, October 1933 - Upper Mississippi River 9-Foot Channel Project, Lock and Dam 26, Alton, Madison County, IL HAER ILL,60-ALT,3-63.tif

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LOCKS - GENERAL PLAN Drawing No. M-L 26 22-1, October 1933 - Upper Mississippi River 9-Foot Channel Project, Lock and Dam 26, Alton, Madison County, IL
Title
LOCKS - GENERAL PLAN Drawing No. M-L 26 22-1, October 1933 - Upper Mississippi River 9-Foot Channel Project, Lock and Dam 26, Alton, Madison County, IL
Description
U.S. Army Corps of Engineers
Depicted place Illinois; Madison County; Alton
Date Documentation compiled after 1968
Dimensions 4 x 5 in.
Current location
Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print
Accession number
HAER ILL,60-ALT,3-63
Credit line
This file comes from the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER) or Historic American Landscapes Survey (HALS). These are programs of the National Park Service established for the purpose of documenting historic places. Records consist of measured drawings, archival photographs, and written reports.

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Notes
  • Significance: The Upper Mississippi River Nine-Foot Channel Project represents one of the largest and most ambitious river improvement projects ever constructed in the United States. The project's origins date to the 1920s and the efforts of Upper Midwest commercial interests to improve their access to markets. During the early years of the Great Depression, the project became transformed into a massive public works program intended to relieve local and regional unemployment. The locks and dams that comprise the project constitute seminal developments in the technological history of American river navigation projects. The project pioneered the use of non-navigable movable dams in the United States. Designers and engineers from the U.S. Army Corps of Engineers committed themselves to a foreign technology, by their decision to incorporate roller gates into the majority of the project's dams and, more importantly, developed new and improved versions of the simpler and more reliable Tainter gate at such a rapid rate that, by the end of the 1930s, roller gates had become a passe technology. The successful completion of the Nine-Foot Channel Project transformed the Upper Mississippi River into an intra-continental canal, providing a fully navigable interior river system throughout the Midwest. The project significantly altered the environment of the Upper Mississippi, but it also served as an impetus for the improvement of drinking water and sewage disposal systems in towns and cities located along the river. Additionally, the project provided new recreational opportunities to the general public.
  • Survey number: HAER IL-31
  • Building/structure dates: 1938 Initial Construction
Source https://www.loc.gov/pictures/item/il0555.photos.063028p
Permission
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Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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