Wikipedia has this to say in its entry on the Johnstown Flood:

Bruce Springsteen's song "Highway Patrolman", from the Nebraska album (1982), references the event. The narrator of the song and his brother take turns "dancing with Maria, as the band played 'Night of the Johnstown Flood'". (This is an anachronism, since in 1982 there was still no song in existence bearing the title "Night of the Johnstown Flood.") Johnny Cash made a cover of the song.