Shannon Hamilton’s trip to the White County bridge in mid-March was a father’s worst nightmare — identifying his 16-year-old daughter, Cecily, as one of two fatal wreck victims. In an incident that has since captured national attention, the Hall County man returned Sunday with other strong emotions as he sought to take matters into his own hands and make temporary improvements to the bridge on Gene Nix Road. “Daddy was on a mission,” he said Monday morning.