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 Charles River Bridge progress on foundation #8 Charles River Bridge piling for falsework between 8+9 Charles River Bridge progress on foundation 3 Charles River Bridge progress on foundation 8 Charles River Bridge progress on #3 Charles River Bridge, general view, looking toward Cambridge from lock tower, Boston, Mass. Charles River Bridge foundation 10+11 Charles River Bridge foundation #3 Charles River Bridge foundation #3 Charles River Bridge foundation #3 Charles River Bridge progress on foundation 3 Charles River Bridge progress on foundation 3 Charles River Bridge foundation 3 Charles River Bridge foundation 3 Charles River Bridge foundation 3 Charles River Bridge foundation 3 n. side Charles River Bridge progress on 5 Charles River Bridge laying stone of foundation #3 Charles River Bridge progress on foundation 5 Charles River Bridge boulder concrete dovetailing, etc. foundation #3 Charles River Bridge overflow conduit in foundation #3 Charles River Bridge overflow condition in foundation #3 Charles River Bridge progress on foundation #3 Charles River Bridge progress on #5 Charles River Bridge progress on foundation #3 Charles River Bridge progress on foundation #5 Charles River Bridge progress on #3 Charles River Bridge progress on foundation 5 32 Lowell St.