File:GENERAL VIEW SHOWING TRUSS AND MASONRY ABUTMENTS, LOOKING DOWNSTREAM - Ponakin Road Bridge, Spanning Nashua River on Ponakin Road, Lancaster, Worcester County, MA HAER MASS,14-LANC.V,2-2.tif

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GENERAL VIEW SHOWING TRUSS AND MASONRY ABUTMENTS, LOOKING DOWNSTREAM - Ponakin Road Bridge, Spanning Nashua River on Ponakin Road, Lancaster, Worcester County, MA
Title
GENERAL VIEW SHOWING TRUSS AND MASONRY ABUTMENTS, LOOKING DOWNSTREAM - Ponakin Road Bridge, Spanning Nashua River on Ponakin Road, Lancaster, Worcester County, MA
Description
Post , Simeon S; Watson Manufacturing Company; Thayer, Nathaniel; Wilder, Charles L; Parker, George A; Thissle, Joshua; Post, Andrew J; Jackson, Donald C, transmitter; Massachusetts Department of Public Works, sponsor; Massachusetts Historical Commission, sponsor; Garvey, Jane F, sponsor; Turner, George R, sponsor; Roper, Stephen J, sponsor; Kapsch, Robert J, sponsor; Fitzgerald, Ella, sponsor; Delony, Eric, project manager; Lowe, Jet, photographer; Stupich, Martin, photographer; Hawley, Monica E, historian; Harshbarger, Patrick, historian; Schodek, Daniel L, delineator; Reese, Patricia, delineator; Kleinschmidt, Gary C, delineator; Payne, Chris, delineator; Fleisig, Morgan, delineator; Rowan, Mark, delineator; Sosef, Rudolph J, A, delineator; Bennett, Lola, historian; Healy, John, historian; Debnam, Albert N, delineator
Depicted place Massachusetts; Worcester County; Lancaster
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 MASS,14-LANC.V,2-2
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 single span Ponakin Road Bridge is 100 feet long and 20 feet wide, with vertical end posts. The bridge has diagonal compression members and diagonal eye-bar tension members that extend two panels, with secondary tension rods extending over one panel. The upper chord lateral bracing is riveted and additional bracing is provided by diagonal cross bars. This truss was developed by Simeon S. Post in about 1865, with a configuration characterized by compression members inclining towards the center of the bridge. The post truss was an important bridge form in the second half of the 19th century, and widely used for transcontinental railway construction. The Ponakin Road Bridge is the only all metal Post truss bridge surviving in the U.S. This type of bridge is commonly referred to as the Post Patent Truss, but research in the Patent Office records failed to uncover any patents taken out by S.S. Post that describe a truss with inclined compression members. Nevertheless, this type of truss was widely known as the Post truss and it was built in great profusion throughout the East and Midwest between 1865 and 1880. After this time its popularity waned as the standardized Pratt truss began being built in great numbers. The Ponakin Road Bridge is listed on the National Register of Historic Places. The Ponakin Bridge is the only known surviving iron bridge to incorporate all of the design features of Simeon S. Post's patent for an "improved iron truss bridge." Post trusses enjoyed a brief period of popularity in the late 1860s and early 1870s. Railroads often chose Post's bridge for long-span river crossings. The Ponakin Bridge is an unusual example of a Post truss used for a relatively short-span highway bridge. The Ponakin Bridge served a small cotton manufacturing village on the west bank of the North Nashua River. The bridge has sustained some structural damage but has not been significantly altered.
  • Unprocessed Field note material exists for this structure: FN-12
  • Survey number: HAER MA-13
  • Building/structure dates: 1871 Initial Construction
  • Building/structure dates: 1973 Subsequent Work
  • Building/structure dates: 1978 Subsequent Work
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 79000378.
Source https://www.loc.gov/pictures/item/ma1172.photos.077136p
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 location42° 27′ 20.02″ N, 71° 40′ 25″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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current18:24, 21 July 2014Thumbnail for version as of 18:24, 21 July 20145,000 × 3,978 (18.97 MB)Fæ (talk | contribs)GWToolset: Creating mediafile for Fæ. HABS 20 July 2014 (1401:1600)

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