View of work progress at the cofferdam, looking south. A cofferdam is a temporary structure created to expose areas that are normally underwater so that work, such as creating supports or repairs can be completed.
Pittsburgh City Photographer Collection, 1901-2002, AIS.1971.05, Archives Service Center, University of Pittsburgh
Cofferdams--Pennsylvania--Pittsburgh--Design and construction.; Waterworks--Pennsylvania--Pittsburgh--Design and construction.; Railroad bridges--Pennsylvania--Pittsburgh.; Allegheny River (Pa. and N.Y.).; Lincoln-Lemington-Belmar (Pittsburgh, Pa.).
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