United States v. Louisiana
Headline: Court rules 'coast line' means the modern, changeable shoreline and enters the United States' decree, allowing measurement from today’s coast and reducing Texas’s Gulf submerged acreage affecting oil leases and mineral rights.
Holding: The term "coast line" in the Submerged Lands Act refers to the modern, ambulatory coastline, so the Court ordered entry of the United States' supplemental decree measuring the three‑league limit from the current shoreline.
- Reduces Texas’s Gulf submerged acreage, potentially removing 17,000 to 35,000 acres.
- Makes state oil leases vulnerable as the coastline erodes and boundaries shift.
- Requires updated coastal mapping using photogrammetry for precise shoreline measurement.
Summary
Background
The dispute was between the federal government and the State of Texas over how to measure the three‑league (about nine‑mile) strip of submerged land in the Gulf that Texas can claim under the Submerged Lands Act. Cartographers identified Texas’ 1845 coastline and the three‑league line, but natural erosion and some buildup since 1845 changed the present shoreline. Texas argued the three‑league limit should be measured from the 1845 coastline; the United States said it should be measured from the modern, ambulatory coastline. The parties agreed that if the Court sided with the United States, a supplemental decree proposed by the federal government should be entered.
Reasoning
The Court addressed the simple question: what does the Act mean by “coast line” when measuring the maximum three‑league limit? Relying on a prior decision that adopted international convention definitions, the Court concluded that “coast line” means the modern, changeable shoreline. The Court found no reason in the statute or its history to treat the three‑league limit differently. Because the United States’ view prevailed and the parties had agreed on a decree, the Court directed entry of the United States’ proposed supplemental decree.
Real world impact
The ruling means Texas will lose submerged acreage where its present coast has eroded since 1845, a loss estimated at between 17,000 and 35,000 acres. State oil and mineral leases along the coast may be affected as boundaries shift, and officials will need careful shoreline mapping (photogrammetry) to set and maintain these limits. The Court noted that any unfairness from this reading of the law is for Congress, not the courts, to remedy.
Dissents or concurrances
Justice Black dissented, arguing for Texas. He warned the decision creates unfair, one‑sided losses for Texas and urged using the historic 1845 line or a government agency (Coast Guard) line to avoid instability for leases and clearer long‑term boundaries.
Opinions in this case:
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