Rescue crews pulled three people from the water after their boat flipped over on Lac qui Parle lake near Boyd's Landing Saturday afternoon, KARE 11 reports.
A man and a girl were taken to Johnson Memorial Hospital in Dawson.
A woman was taken to the Chippewa County Hospital in Montevideo.
Both the girl and the woman were pronounced dead at the hospitals.
Officials are still investigating the accident. Names of the victims have not been released.