Excerpt from the January 1998 Ensign article, The Flood and the Tower of Babel – January 1998 Ensign

Still other people accept parts of the Flood story, acknowledging that there may have been a local, charismatic preacher, such as Noah, and a localized flood that covered only a specific area of the world, such as the region of the Tigris and Euphrates Rivers or perhaps even the whole of Mesopotamia. Yet these people do not believe in a worldwide or global flood. Both of these groups—those who totally deny the historicity of Noah and the Flood and those who accept parts of the story—are persuaded in their disbelief by the way they interpret modern science. They rely upon geological considerations and theories that postulate it would be impossible for a flood to cover earth’s highest mountains, that the geologic evidence (primarily in the fields of stratigraphy and sedimentation) does not indicate a worldwide flood occurred any time during the earth’s existence.

There is a third group of people—those who accept the literal message of the Bible regarding Noah, the ark, and the Deluge. Latter-day Saints belong to this group. In spite of the world’s arguments against the historicity of the Flood, and despite the supposed lack of geologic evidence, we Latter-day Saints believe that Noah was an actual man, a prophet of God, who preached repentance and raised a voice of warning, built an ark, gathered his family and a host of animals onto the ark, and floated safely away as waters covered the entire earth. We are assured that these events actually occurred by the multiple testimonies of God’s prophets.

Crash Course:
The Flood and the Tower of Babel – January 1998 Ensign
Conflicts with Science – Mormon Think