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Photo, Print, Drawing Braddock Dam, Braddock, Allegheny County, PA

[ Data Pages from Survey HAER PA-635  ]

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[ Photo Captions from Survey HAER PA-635  ]

About this Item

Title

  • Braddock Dam, Braddock, Allegheny County, PA

Names

  • Historic American Engineering Record, creator
  • Monongahela Navigation Company
  • Edwardo, Henry
  • Ben C. Gerwick, Inc.
  • D'Appolonia
  • Bergmann Associates
  • J. A. Jones Construction Company
  • Traylor Brothers Inc.
  • Hampton, Roy A., III, historian
  • Hardlines Design Company, contractor
  • Christianson, Justine, transmitter
  • Weiser, Conrad E., photographer
  • Bates, Jeff, photographer
  • Judkis, Jim, photographer
  • U.S. Army Corps of Engineers, Pittsburgh District, sponsor
  • McPartland, Mary, transmitter

Created / Published

  • Documentation compiled after 1968

Headings

  • -  reinforced concrete construction
  • -  dams
  • -  Tainter gates
  • -  civil engineering
  • -  navigation
  • -  spillways
  • -  weirs
  • -  precast concrete construction
  • -  tailraces
  • -  concrete piers
  • -  Pennsylvania--Allegheny County--Braddock

Latitude / Longitude

  • 40.388611,-79.85955485915454

Notes

  • -  Braddock Dam replaced Locks & Dam No. 2. See HAER No. PA-558 for additional documentation.
  • -  Significance: The U.S. Army Corps of Engineers, Pittsburgh District, planned the construction of Braddock Dam in the 1990s and began it in 2000 as part of a $750 million (2004 price level) modernization of the lower Monongahela navigation system. Braddock Dam replaced Monongahela River Dam 2 and allows for removal of Locks and Dam 3. In 1997, the Pittsburgh District decided to use innovative in-the-wet construction methods to build the Braddock Dam. These construction methods involved prefabricating the dam's base at a remote casting basin, with the base in the form of two hollow concrete segments that could be floated to the dam site (a "float-in" system). Once completed, the dam segments were floated up the Ohio and Monongahela rivers and set in place on a prepared foundation at the construction site. This construction method, developed from techniques used to build immersed tunnels and offshore oil-rig platforms, had not been used previously for an inland navigation dam in the United States. This innovative approach eliminated the need for extensive cofferdams and cofferboxes on the construction site and allowed construction to proceed simultaneously on both the foundations and the concrete base sections of the dam. These techniques accelerated the construction schedule of the dam, saved money, and eliminated the dangers associated with conventional in-the-dry construction. The construction of Braddock Dam has been published in several engineering journals and is recognized internationally for its use of new construction techniques and technologies.
  • -  Survey number: HAER PA-635
  • -  Building/structure dates: 2000 Initial Construction

Medium

  • Photo(s): 247
  • Data Page(s): 38
  • Photo Caption Page(s): 66

Call Number/Physical Location

  • HAER PA-635

Source Collection

  • Historic American Engineering Record (Library of Congress)

Repository

Control Number

  • pa4005

Rights Advisory

Online Format

  • image
  • pdf

Rights & Access

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Obtaining Copies

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Cite This Item

Citations are generated automatically from bibliographic data as a convenience, and may not be complete or accurate.

Chicago citation style:

Historic American Engineering Record, Creator, Monongahela Navigation Company, Henry Edwardo, Inc Ben C. Gerwick, D'Appolonia, Bergmann Associates, J. A. Jones Construction Company, et al., Weiser, Conrad E, Jeff Bates, and Jim Judkis, photographer. Braddock Dam, Braddock, Allegheny County, PA. Braddock Allegheny County Pennsylvania, 1968. translateds by Christianson, Justinemitter, and Mcpartland, Marymitter Documentation Compiled After. Photograph. https://aj.sunback.homes/item/pa4005/.

APA citation style:

Historic American Engineering Record, C., Monongahela Navigation Company, Edwardo, H., Ben C. Gerwick, I., D'Appolonia, Bergmann Associates [...] U.S. Army Corps Of Engineers, P. D., Weiser, C. E., Bates, J. & Judkis, J., photographer. (1968) Braddock Dam, Braddock, Allegheny County, PA. Braddock Allegheny County Pennsylvania, 1968. Christianson, J. & McPartland, M., transs Documentation Compiled After. [Photograph] Retrieved from the Library of Congress, https://aj.sunback.homes/item/pa4005/.

MLA citation style:

Historic American Engineering Record, Creator, et al., photographers by Weiser, Conrad E, Jeff Bates, and Jim Judkis. Braddock Dam, Braddock, Allegheny County, PA. trans by Christianson, Justinemitter, and Mcpartland, Marymitter Documentation Compiled After. Photograph. Retrieved from the Library of Congress, <aj.sunback.homes/item/pa4005/>.