Charles River Bridge progress on pier 7+8 Charles River Bridge progress on piers 6-7-8 Charles River Bridge looking n. form pier #4 Charles River Bridge progress on #4 Charles River Bridge progress on pier foundation #9 Charles River Bridge foundation #9 Charles River Bridge progress on foundation #9 Charles River Bridge, general view, from Boston & Maine Railroad coal shed, Boston, Mass. Charles River Bridge foundation #3 Charles River Bridge progress on #9 Charles River Bridge progress #9 Charles River Bridge fal work at #9 Charles River Bridge progress on 2+3 Charles River Bridge general view looking northerly from lock tower Charles River Bridge westerly from lock tower Charles River Bridge #3 progress on 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. Charles River Bridge Foundation 3 Charles River Bridge progress on foundation #5 Charles River Bridge looking toward Boston from near pier #8 Charles River Bridge foundation #3 Charles River Bridge, pier #13, types of trolley poles