United States v. California
The Supreme Court approved a joint request from the United States and California to enter a fifth supplemental decree pinpointing, with precise map coordinates, the boundary separating California's offshore lands from federal offshore lands.
This is a technical, cooperative update to a boundary the Court first set in 1947, and it does not change who owns what in any legal sense — it just fixes the line's exact location on the map so both governments can administer it consistently going forward.
How it got here: The United States and California jointly asked the Supreme Court, which retains original jurisdiction over this boundary dispute, to enter a fifth supplemental decree.
The Case in Depth
What happened
In 1947 the Supreme Court decided that the United States, not California, owns the submerged lands off the California coast beyond a certain point, and issued decrees over the following decades refining exactly where that federal-state line runs. This latest filing is a joint request by the two governments to fix the line's precise location using modern GPS-based coordinates.
The question before the Court
Where exactly does the underwater boundary line sit between California's coastal waters and federal ocean territory off the state's coast?
Why it matters
This decree gives federal and state agencies, energy companies, and fishery regulators a precise, fixed set of coordinates for deciding whether a given patch of seabed off California falls under state or federal control, which affects who can lease it for drilling, mining, or other offshore activity.
What changes now
The boundary described in this decree is now immobilized at the stated coordinates and will not shift with future changes in the coastline. The Court retains ongoing jurisdiction to issue further orders if needed to enforce or clarify the decree, but no further merits proceedings are contemplated; this was a final, technical implementation of boundaries already established in prior rulings.
What this does not decide
This decree does not decide any new question about who owns which resources; it only pins down, with GPS coordinates, the precise location of a federal-state boundary the Court had already established in earlier decisions dating back to 1947.
How the Court got there
The legal reasoning, step by step
- The Court had already resolved, in its 1947 original decree and later supplemental decrees, that the United States holds the submerged lands seaward of a defined line and California holds those landward of it, so this filing did not revisit that underlying entitlement.
- Because the Submerged Lands Act allows the federal-state boundary to be fixed rather than shifting with the coastline over time, the Court applied that statutory authority to lock in the line at specific coordinates rather than leaving it tied to a moving shoreline.
- The two governments jointly proposed detailed geographic coordinates, expressed in a standard mapping system, marking the boundary's path along the mainland coast, the Farallon Islands, and the Channel Islands.
- Finding the joint proposal appropriate for giving the existing legal boundary greater precision, the Court adopted the coordinates as an official decree and directed that the boundary remain fixed at those points going forward.
Doctrinal impact
Cases affected by this decision
Reaffirms United States v. California (332 U.S. 804)
The 1947 decree's basic division of offshore lands between the U.S. and California is relied on and left intact.