146 U.S. 387 (1892), Supreme Court of the United States
Illinois Central Railroad Co. v.
May a state convey to a private corporation, in fee, the submerged lands underlying a navigable waterway—including an entire harbor—and thereby abdicate its public trust over those waters, and if it attempts to do so, may a subsequent legislature revoke that grant without violating the Contracts Clause or due process?
Under the public trust doctrine, each state holds title to the beds of navigable waters within its borders in trust for the people for purposes such as navigation, commerce, and fishing. This sovereign trust, which accompanies statehood under the equal-footing doctrine, prevents the state from permanently alienating or substantially impairing the public's interest by placing an entire harbor or vast submerged lands under private control. While a state may convey limited parcels of submerged land or authorize structures (e.g., wharves, piers) when consistent with and in furtherance of the trust purposes and when such grants do not substantially impair public uses, it cannot abdicate general control over navigable waters and their beds. Attempts to convey such control are either void or revocable; they do not create protected contract rights against the state's reassertion of the trust. Riparian owners may enjoy certain access and wharfing rights, but these remain subject to the state's paramount regulatory authority to protect navigation, commerce, and the public interest.
The 1869 legislative grant conveying most of the submerged lands of the Chicago harbor in Lake Michigan to Illinois Central Railroad was invalid because it attempted to abdicate the State's public trust in navigable waters. The 1873 repeal was effective, and title to the submerged lands remained with the State. The railroad, however, retained limited riparian rights appurtenant to its upland holdings and could maintain previously authorized and lawfully constructed improvements, all subject to the State's continuing regulatory authority.
Illinois Central is the foundational articulation of the public trust doctrine in American law. It clarifies that states hold submerged lands beneath navigable waters in trust and may not irrevocably privatize them in ways that substantially impair public uses. The decision informs modern coastal and environmental governance, ensuring public access and state regulatory authority over waterfront development. It also frames limits on legislative power and the Contracts Clause where core sovereign and trust functions are at stake, and it guides courts assessing whether particular grants or improvements are consistent with or contrary to the public trust.