South side of Causeway, west side of Canal Street, Boston, Mass. Charles River Bridge Foundation 4 South side of Causeway Street, Boston, Mass. South side of Causeway Street, west side of Friend Street, Boston, Mass. South side of Causeway Street, east corner Portland Street, Boston, Mass. Welding of concrete Charles river dam Cambridge side Charles River Bridge, Boston end, cutting out concrete Charles River Bridge, pier excavated to grade Charles River Bridge Charles River Bridge Charles River Bridge cutting out concrete Boston side looking s. Charles River Bridge, looking s. opposite Main lock Charles River Bridge, looking s. opposite Main lock Charles River Bridge, excav. for Pier 19 Charles River Bridge, looking s. opposite small boat lock Charles River Bridge, progress on Pier 4 Charles River Bridge, progress on Pier 4 Charles River Bridge, progress on Pier 10 Charles River Bridge Charles River Bridge looking n. from s. for Pier 4 Charles River Dam Charles River Bridge progress on foundation #10 Charles River Bridge progress on foundation #9 Charles River Bridge progress on foundation #9+10 Charles River Bridge progress on Pier #9 Charles River Bridge progress on Pier #4 Charles River Bridge progress on Pier #4 Charles River Bridge progress on Pier #4 Charles River Bridge near Pier #3 Charles River Bridge progress on pier foundation Charles River Bridge progress on pier foundation #10 Charles River Bridge foundation Pier #4 looking s. Charles River Bridge foundation Pier #4 excavation to grade pile heads Looking northerly from near pier #4 Looking southerly form near pier #4 Pier #3 Pier #3 Charles River Bridge excavation for Pier 10 Charles River Bridge excavation for Pier 10 Charles River Bridge looking down into #10 Excavation for pier #9 Charles river Bridge Charles River Bridge foundation Pier #3 Charles River Bridge looking southerly Pier 4 Charles River Bridge looking w. over Pier #3 Charles River Bridge looking s. across #3 Looking n. across foundation #9 Looking down into foundation #10 Charles River Bridge Foundation #3 Charles River Bridge Foundation #3 Brick sewer, 52 Causeway St.