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File:DETAIL OF CONNECTIONS OF WEST TRUSS, FROM EAST - Nishnabotna River Bridge, Spanning Nishnabotna River, Manilla, Crawford County, IA HAER IOWA,24-MAN.V,1-; -6.tif

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DETAIL OF CONNECTIONS OF WEST TRUSS, FROM EAST - Nishnabotna River Bridge, Spanning Nishnabotna River, Manilla, Crawford County, IA
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H. Gene McKeown and Association
Title
DETAIL OF CONNECTIONS OF WEST TRUSS, FROM EAST - Nishnabotna River Bridge, Spanning Nishnabotna River, Manilla, Crawford County, IA
Depicted place Iowa; Crawford County; Manilla
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 IOWA,24-MAN.V,1-; -6
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.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

Notes
  • Significance: The availability of steel for domestic purposes like bridge building was severely limited during World War II. Most of the counties of Iowa, including Crawford County, turned to timber to fulfill their short-span bridge construction needs. In May of 1945, however, heavy flooding washed out 27 bridges and culverts throughout the county. It was decided to build replacement spans using steel. The Des Moines Steel Company was hired to design and fabricate the bridges. Forced to economize with material they turned to a bridge form that was popular in the 1860s and 1870s: the bowstring arch-truss. Although lacking the lateral stability of later bridge forms, the bowstring offered outstanding structural efficiency. During the period of the 1860s and 1870s thousands of bowstring arch-trusses were built throughout the nation. In a time of national crisis this once popular bridge form again supplied the solution. The Nishnabotna bridge is an excellent example of this series of bridges built during the war.
  • Unprocessed Field note material exists for this structure: N220
  • Survey number: HAER IA-48
  • Building/structure dates: 1945 Initial Construction
References

This is an image of a place or building that is listed on the National Register of Historic Places in the United States of America. Its reference number is 98000801.
Source https://www.loc.gov/pictures/item/ia0424.photos.051299p
Permission
(Reusing this file)
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.
Object location41° 53′ 22.99″ N, 95° 13′ 54.98″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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current11:14, 14 July 2014Thumbnail for version as of 11:14, 14 July 20145,000 × 4,068 (19.4 MB)Fæ (talk | contribs)GWToolset: Creating mediafile for Fæ. HABS 11 July 2014 (1001:1200)

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