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• Collection: Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey

• Title: Emsworth Locks and Dams, Locks and Main Channel Dam, Ohio River Mile Marker 6.2, Emsworth, Allegheny County, PA
• Creator(s): Historic American Engineering Record, creator
• Related Names:
     U.S. Army Corps of Engineers
     Dravo Corporation
     Seeds and Derham Company
     American Bridge Company
     Wellons, C. M.
     Pratt, Ralph
     Vierheller, Howard
     Hardlines Design Company , contractor
     U.S. Army Corps of Engineers, Pittsburgh District , sponsor
     Hampton, Roy A. , historian
     Bates, Jeff , photographer
     Christianson, Justine , transmitter
     McPartland, Mary , transmitter
• Date Created/Published: Documentation compiled after 1968
• Medium: Photo(s): 122
  Data Page(s): 32
  Photo Caption Page(s): 17
• Reproduction Number: ---
• Rights Advisory: No known restrictions on images made by the U.S. Government; images copied from other sources may be restricted. (http://www.loc.gov/rr/print/res/114_habs.html)
  
• Call Number: HAER PA-637-A
• Repository: Library of Congress Prints and Photographs Division Washington, D.C. 20540 USA http://hdl.loc.gov/loc.pnp/pp.print
• Notes:
  • Significance: The U.S. Army Corps of Engineers, Pittsburgh District, began construction on Emsworth Locks and Dams in 1919 to replace Davis Island Dam, the first lock and dam facility on the Ohio River, and Lock and Dam 2. The Emsworth facility was completed in 1922, with concrete fixed-crest dams and two locks. From 1935-38, a concrete movable-crest gated dam was constructed at the site. The facility was the second gated dam to be built on the Ohio River and is one of only two dams on the river that have vertical-lift gates, while dams built on the Ohio after World War II generally have Tainter gates, which rotate up and down on trunnion-mounted hinges. The complex has two components, the lock and dam on the main channel and a second dam on the back channel. The locks are significant as one of only three sets of locks on the Ohio River that use a pre-1927 system of multiple filling and emptying culverts with multiple valves. The main dam is significant as one of only a few dams on the Ohio River with vertical-lift gates. The main dam and locks have also played an important role in maintaining river commerce on the upper Ohio River, especially in Pittsburgh.
  • Survey number: HAER PA-637-A
  • Building/structure dates: 1919-1922 Initial Construction
  • Building/structure dates: 1935-1938 Subsequent Work
  • Building/structure dates: 1981-1983 Subsequent Work
  • Building/structure dates: 1973-1977 Subsequent Work
  • Building/structure dates: ca. 2005- ca. 2011 Subsequent Work
• Subjects:
  • dams
  • locks (hydraulic facilities)
  • miter gates
  • butterfly valves
  • concrete walls
  • sheet piling
  • trestles
  • powerhouses
  • gates (engineering)
  • movable dams
  • girder bridges
  • concrete piers
  • cranes
  • reinforced concrete construction
  • hydraulic engineering
  • navigation
  • transportation
  • hoisting machinery
  • bulkheads (walls)
  • New Deal
  • people
• Place:
  • Pennsylvania--Allegheny County--Emsworth
• Latitude/Longitude: 40.503176, -80.089271
• Collections:
  • Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey
• Part of: Historic American Engineering Record (Library of Congress)
• Bookmark This Record:
     https://www.loc.gov/pictures/item/pa4184/

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• Rights Advisory: No known restrictions on images made by the U.S. Government; images copied from other sources may be restricted. http://www.loc.gov/rr/print/res/114_habs.html
• Reproduction Number: ---
• Call Number: HAER PA-637-A
• Medium: Photo(s): 122
  Data Page(s): 32
  Photo Caption Page(s): 17

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• Call Number: HAER PA-637-A
• Medium: Photo(s): 122
  Data Page(s): 32
  Photo Caption Page(s): 17

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