Louisiana v. Mississippi
Headline: Court fixes Mississippi River boundary at Deadman’s Bend, confirms the live thalweg as the true line, and sets precise coordinates and dates affecting control near Louisiana State Well No. 1.
Holding:
- Fixes exact state boundary line in Deadman’s Bend along the river thalweg.
- Declares Louisiana State Well No. 1 was inside Mississippi beginning February 28, 1955.
- Splits the litigation costs evenly between Louisiana and Mississippi.
Summary
Background
This dispute involved the States of Louisiana and Mississippi over the exact boundary in the Mississippi River area known as Deadman’s Bend. A court-appointed Special Master (a surveying expert) filed a report describing where the river’s main channel, or “live thalweg,” lay on October 3, 1952, and April 10, 1964. Each state filed exceptions to that report, and the Court considered those objections before issuing this decree.
Reasoning
The main question was practical: where was the true state line at different dates in Deadman’s Bend? The Court overruled all exceptions and confirmed the Special Master’s report. It held that the river’s live thalweg has been the true boundary at all relevant times. The opinion gives exact geodetic coordinates for the thalweg in 1952 and 1964. It also explains that the thalweg moved at a constant rate between those dates and prescribes a mathematical method to calculate the boundary for any intervening date and place.
Real world impact
As a result, the Court fixed who controls specific riverbank areas and related property interests in Deadman’s Bend. The decree states that Louisiana State Well No. 1 became located inside Mississippi on February 28, 1955. The Special Master’s work is complete and he is discharged, and the Court orders the litigation costs to be split equally between the two States. These rulings clarify land and resource control, local regulation, and which State’s laws apply in the affected area.
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