Monongahela River Lock & Dam No. 7, River Mile No. 85, Greensboro, Greene County, PA

Part of the Monongahela River Recording Project, which included HAER PA-300, Port Perry Bridge; HAER PA-385, Monongahela Navation Company Lock and Dam No. 7; and HAER PA-304, Lower Monongahela River Public Improvements. Individual site reports related to the Lower Monongahela River Public Improvements can be found at HAER PA-390 through HAER PA-400.

Significance: Lock & Dam No. 7 are among the oldest structures of the Monongahela River navigation system. The engineering design and materials used are typical of lock and dam engineering in the United States during the 1920s.

Unprocessed Field note material exists for this structure: N763

Survey number: HAER PA-299

Building/structure dates: 1923-1926 Initial Construction

dams lift locks concrete buildings pentagonal buildings navigation public works greene county monongahela lock monongahela river lock dam river mile greensboro greene pennsylvania river lock michael bennett curtis g burlbaw james r christensen lisa pfueller davidson eric n delony dravo corporation jonathan gill dean herrin historic american engineering record jet lowe christopher h marston pittsburgh chamber of commerce pittsburgh coal exchange r brian price frances c robb us army corps of engineers pittsburgh district us army corps of engineers photo ultra high resolution high resolution coal mines and mining port mining industry library of congress industrial history

1969 - 1980

Library of Congress

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