A view of a coffer dam, an enclosure within the river constructed to allow water to be displaced for the purpose of creating a dry work environment, during the process of installing a forty-eight inch steel pipe across the river.
October 7th, 14
Pittsburgh City Photographer Collection
Pittsburgh City Photographer Collection, 1901-2002, AIS.1971.05, Archives Service Center, University of Pittsburgh
Public Domain - Anybody may use this photo for any purpose
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Copyright 2015 Dane Pieri