Arkansas v. Tennessee

Background

Two neighboring states asked the Court to fix a boundary along part of the Mississippi River bed that was left dry after an 1876 sudden change in the river. A court-appointed team of three commissioners, named by a 1918 decree, examined the area in 1918–1920 and filed a report in May 1921 proposing a line. The commissioners used historical maps, a government 1874 reconnaissance by Major Suter, field surveys, and testimony from steamboat men and others. One state objected, arguing the old middle channel could not be located with reasonable certainty and that the Suter map was unreliable.

Reasoning

The central question was whether the commissioners could reasonably locate the middle of the main navigable channel as it existed before the 1876 avulsion. The Court said absolute precision was not required; a practical degree of certainty based on multiple sources was enough. The justices found the commissioners properly used field inspection, surveys, the Suter reconnaissance as a general guide, and witness testimony to determine the line. The Court accepted specific findings, such as Island 37 being on the Tennessee side and Island 39 falling within Arkansas public surveys, and overruled the objections.

Real world impact

The confirmed line settles which state controls and owns that stretch of dry riverbed and resolves local jurisdiction and property questions tied to the boundary. The Court also required the objecting state to pay for printing the report and testimony, finding the printing unnecessary; all other expenses and the commissioners’ pay will be split equally. The Court entered a formal order to carry out these results and allowed the parties forty days to propose the exact form of the decree.