Gertie Wadsworth was in the arms of her grandmother that bright day when sunshine dissolved distasteful memories of a long, brutal winter. Christan Goble held the 3 1/2-year-old girl in a crowd of more than 200 on the bridge over the Rock River. After a procession down Galena Avenue from the Baptist Church on May 4, 1873, the Rev. J.H. Pratt began baptizing parishioners in the brisk, rapid current. Then, with a sharp crack and a crescendo of shrieking spectators loaded on the pedestrian walkway in front of towering trusses, the 4-year-old bridge twisted, splintered and rolled over. Forty-six people...