Helena Police Department is asking the public for help locating 16-year-old Madeleine Elizabeth Oppel.
Oppel is about 5'5", 120 pounds with brown hair and hazel eyes. Her current clothing is unknown.
She went missing some time after midnight on Friday or early Saturday morning.
Helena police said anyone with information on Oppel's whereabouts can contact the Helena Police Department at 406-442-3233, or the nearest law enforcement agency.
Police said they don't believe there is anything suspicious surrounding Oppel's disappearance.