Summary

Wiley Blount Rutledge Kansas v. Missouri (322 U.S. 213…

Kansas clearly has failed to prove that there was a single channel of the river which gradually moved over to the farthest erosion point, meanwhile accreting this land to her soil, then suddenly moved back, either in 1917 or in 1927, to a new channel cut through the accreted soil. Only by accepting the evidence given by the few witnesses who supported this theory, which was contradicted both by the weight of her own evidence concerning island formation and by substantially all that was offered for Missouri, could a finding in Kansas' favor be made under the theory of accretion and avulsion.
Source: Wikisource

Wiley Blount Rutledge Kansas v. Missouri (322 U.S. 213…

There is, however, at least an equal weight of evidence, given both by Missouri witnesses and by some for Kansas, that the Kansas channel remained the main navigable channel throughout the period of division.
The evidence on this controlling issue unfortunately is not as free from conflict or doubt as we might wish. But it cannot be said, when account is taken of all the evidence, both oral and documentary, that a preponderance sustains Kansas' view that the main channel ever changed to the Missouri side. Kansas' burden required preponderant proof. She has not made it.
Source: Wikisource

Wiley Blount Rutledge Kansas v. Missouri (322 U.S. 213…

Missouri denies that the land accreted to Kansas, that there was avulsion, or that the island ever lay on the Kansas side of the main channel.
The states are not in dispute about the applicable law. They agree that when changes take place by the slow and gradual process of accretion the boundary moves with the shifting in the main channel's course.
Source: Wikisource

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