delivered the opinion of the Court.
This case comes here on writ of certiorari to review a determination of the Court of Appeals of New York,
Respondents, it is stipulated, are riparian owners on the Mohawk River, above its confluence with the Hudson, where at a point about three miles above the Federal Dam they own a dam and water power which they maintain for the development of power for use in their factories on adjacent land. The' petitioner, a private business corporation, has procured from the Federal Power Commission a license for a hydro-electric power project, purporting to be granted under the Federal Water Power Act of June 10, 1920, 41 Stat. 1063 (U. S. C., Title 16, c. 12)., The license granted permission to use surplus water from the Federal Dam for the development of power at a plant to be constructed and maintained by petitioner for that .purpose, on government land. As the license also per *375 mits, but does not require, petitioner has placed flash-boards on the crest of the dam which, under normal conditions, raise the level of the water in the pool above the dam approximately two feet. Electric power developed by the project is used in the business of an affiliated private manufacturing corporation. The maintenance of the water at the new level has resulted in materially raising the water at the tail-races of respondents’ power plants, with - a corresponding reduction of the head of water and of the power developed at their dam.
As the court below held, the acts complained of constitute, under local law, an actionable wrong, entitling respondents to an injunction and to damages.
Hammond
v.
Fuller,
1 Paige (N. Y.) 197;
Brown
v.
Bowen,
It is contended that the navigable capacity of the Hudson and the Mohawk is subject to the regulation and control of Congress, under Clause 3 of § 8, Art. I, of the Constitution,
Gibbons
v.
Ogden,
It is argued that Congress, by the Federal Water Power. Act, has authorized the Commission to develop navigation and for that purpose to establish obstructions in navigable waters and, subject only to the constitutional requirement of compensation for property taken, its power when so exercised is supreme; that the present exercise of that power does not amount to a taking of the respondents’ property for the reason that it does not appear that the obstruction has so raised the water as to flood the respondents’ land, and any right of theirs recognized by the state and asserted here, to have the river flow in its natural manner without obstruction, is subordinate to the power of the national government exerted by the Commission through its licensee, whose action so far as it affects respondents’ water power, is
damnum absque injuria. United States
v.
Chandler-Dunbar Co.,
The respondents insist, as the court below found, that the Federal Dam was designed to be sufficient for purposes of navigation without the flashboards and it was unnecessary to use them for purposes of navigation; that the petitioner had installed them for the development of power for its own private use; that the effect upon navigation of the power plant and flashboards is negligible, hence the licensed project was not one authorized under the Federal Water Power Act. In any case, it is urged that the injury and damage complained of amount to a taking of respondents’ property without compensation and, further, that the Federal Water Power Act, by its terms, does not authorize the granting of licenses which would enable the licensee to destroy or affect the rights of riparian owners.
But, in the view we take of the application of the Federal Water Power Act to the present case, it is unnecessary to decide all the issues thus sharply raised. -Whether the Commission acted within or without its jurisdiction in granting the license, and even though the rights which' the respondents here assert be deemed subordinate to the power of the national government to control navigation, the present legislation does not purport to authorize a licensee of the Commission to impair such rights recognized by state law without compensation. Even though not immune from such destruction they are, nevertheless, an appropriate subject for legislative protection. See
United States
v.
Realty Co.,
Section 10(c) (U. S. C., Title 16, § 803(c)) provides that licensees “ shall be liable for all damages occasioned to the property of others' by the construction, maintenance or operation ” of the licensed project and by § 27 (U. S. C., Title 16, § 821) it is provided, “Nothing contained in this chapter shall be construed as affecting or intending to affect or in any way to interfere with the laws of the respective states relating to the control, appropriation or distribution of water used in irrigation or for municipal or other uses, or any vested right acquired therein.” By § 21 (U. S. C., Title 16, § 814), licensees are given the power of eminent domain and authorized to conduct condemnation proceedings in district or state courts for the acquisition “ of the right to use or damage the lands or property of others necessary to the construction, maintenance or operation of any dam . . . [or] . . . diversion structure . . in connection with an authorized project which they are unable to acquire by contract. By § 6 (U. S. C., Title 16, § 799), all licenses are required to be “ conditioned upon acceptance by the licensee of all the terms and conditions of this Act.”
While these sections are consistent with the recognition that state laws affecting the distribution or use of water in navigable waters and the rights derived from those laws may be subordinate to the power of the national government to regulate commerce upon them, they nevertheless so restrict the operation of the entire act that the powers conferred by it on the Commission do not extend to the impairment of the operation of those laws or to the extinguishment of rights acquired under them without remuneration. We think the interest here asserted by *379 the respondents, so far as the laws of the state are concerned, is a vested right acquired under those laws and so is one expressly saved by § 27 from destruction or appropriation by licensees without compensation, and that it is one which petitioner, by acceptance of the license under the provisions. of § 6, must be deemed to have agreed to recognize and protect. Whether § 21, giving to licensees the power of eminent domain, confers on them power to condemn rights such as those of respondents, and whether it might have been invoked by the petitioner in the present situation, are questions not before us.
Affirmed.
