Texas v. Louisiana

1973-05-14

Headline: Boundary ruling holds Louisiana–Texas border lies along the geographic middle of the Sabine River, settles most ownership issues, and sends disputes over western islands to further proceedings involving the United States.

Holding: The Court held that Louisiana’s western boundary runs along the geographic middle of the Sabine River and adopted the Special Master’s report except for unresolved western-island ownership.

Real World Impact:

Fixes the Louisiana–Texas border along the geographic middle of the Sabine River.
Confirms Louisiana ownership of islands in the river’s eastern half.
Orders further proceedings on western-island ownership and invites U.S. participation.

Topics: state borders, river boundary, island ownership, interstate dispute

Summary

Background

Texas sued Louisiana to decide who controls and owns the western half of Sabine Pass, Sabine Lake, and the Sabine River from the mouth to the 32° north latitude line. The dispute began after both States and Congress passed competing measures in the 1800s about whether Louisiana’s western limit was the river’s middle, its west bank, or the main channel. The case was referred to a Special Master, who recommended the geographic middle as the boundary and proposed rules for island ownership. Both States filed exceptions to that report.

Reasoning

The core question was what Congress meant when it described Louisiana’s western boundary as the river’s “middle.” The Court examined the Enabling Act, Louisiana’s 1812 admission language, later treaties, and the 1848 congressional act consenting to Texas’s extension. The Court concluded Congress intended the geographic middle of the Sabine River as Louisiana’s western border, not the western bank or the river’s main channel (thalweg). The Court adopted the Special Master’s report on the boundary but declined to decide ownership of islands in the river’s western half.

Real world impact

The ruling fixes where Louisiana and Texas exercise jurisdiction in most of the Sabine waterway and confirms Louisiana’s claim to islands in the river’s eastern half. Ownership of islands formed or claimed in the west half remains unresolved. The Court directed further proceedings and asked the United States to present any claims, so the island question is not finally decided now.

Dissents or concurrances

Justice Douglas dissented, arguing the treaties and the long-standing thalweg doctrine supported a different boundary (western bank or main channel) and urged more factfinding on maps, acquiescence, and prescription.