Summary

Portrait of Harlan F. Stone Harlan F. Stone Massachusetts v. New York — Opinion of the Court

The fact that by the English common law, and by the law of those states bounded by tidal waters, the public has rights in the seashore, and that grants extending only to the high-water mark of such waters nevertheless give access to the sea, accounts for the rule, generally recognized and followed, that a grant whose boundaries extend to the 'shore' or 'along the shore' of the sea, carries only to highwater mark.
Source: Wikisource

Portrait of Harlan F. Stone Harlan F. Stone Massachusetts v. New York — Opinion of the Court

On the other hand, a grant of the soil under water in private ownership would have set material limits on the free exercise of the sovereign control of New York over the navigable waters of the state and on the free use of the principal waterway of the newly settled territory. All these considerations lead to the conclusion that the grants in the Treaty of Hartford did not convey to Massachusetts, which took in private ownership, any title in the bed of the lake, unless the technical language employed in the grants compels us to take an opposite view.
Source: Wikisource

Portrait of Harlan F. Stone Harlan F. Stone Massachusetts v. New York — Opinion of the Court

There is no conceivable purpose for which it could be supposed that Massachusetts intended to retain such a proprietary interest in the shore as is now claimed, or to deny to its grantees and to settlers in the granted territory access to the great natural waterway upon its northern boundary. We are not dealing here with the disposition of the jus publicum, but with land held by Massachusetts in private ownership and granted by it to private persons.
Source: Wikisource

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