Mr. Justice Burton
delivered the opinion of the Court.
The most significant issue raised by this case is whether the Federal Water Power Act of 19201 has abolished pri[241]*241vate proprietary rights, existing under state law, to use waters of a navigable stream for power purposes. We agree with the Court of Appeals that it has not. We agree also that in computing a federal licensee’s amortization reserve, required by § 10 (d) of that Act, as amended,2 the Federal Power Commission was not justified in disallowing the expenses paid or incurred by the licensee in this ease for the use of such rights.
March 2, 1921, Niagara Falls Power Company, a New York corporation, predecessor in interest of Niagara Mohawk Power Corporation, a New York corporation, respondent herein, secured from the Federal Power Commission the federal license with which we are concerned. It was the first such license issued under the Federal Water Power Act of 1920. Its term was 50 years. It authorized the diversion of water for power purposes from the Niagara River, above the Falls, and the return of it below the Falls, all in New York. The daily diversion, in the aggregate, could not exceed 19,500 cubic feet per second (c.f. s.).3
[242]*242Section 10 (d) of the Act requires each licensee, after 20 years of operation under such a license, to establish and maintain amortization reserves out of any surplus thereafter earned and accumulated in excess of a reasonable return upon the licensee’s net investment. Section 14 makes such net investment, plus severance damages, a principal measure of the price the Government is to pay when and if it takes over all or part of the property.4 [243]*243In 1942, the Commission expressly held that § 14 applied to this licensee.5
In 1947, Article 11 of the license was amended so as to specify a 6% rate of return and to require 50% of the licensee’s surplus earnings to be paid into its amortization reserves. As so amended, the article read:
“After the first twenty (20) years of operation of the project under this license, namely after March 1, 1941, six (6) per cent per annum shall be the specified rate of return on the net investment in the project for determining surplus earnings in accordance with the provisions of Section 10 (d) of the Act for the establishment and maintenance of amortization reserves to be held until termination of the license, or in the discretion of the Commission, to be applied from time to time in reduction of the net investment in the project, and one-half of all surplus earnings in excess of six (6) per cent per annum received in any calendar year shall be paid into and held in such amortization reserves.”6
[244]*244In 1948, the Commission began this proceeding to determine the licensee’s amortization reserve liability. It was the Commission’s first such effort under § 10 (d). In 1949, pursuant to a revised staff report, the Commission directed the holder of this license to show cause why one-half of its surplus earnings from March 2, 1941, through December 31, 1946, in the amount of $994,521.33, should not be set aside in an amortization reserve, and why a like proportion of its subsequent surplus earnings should not be set aside annually upon a comparable basis. In 1950, the Commission’s presiding examiner recommended that the licensee’s initial reserve be $914,432.04, and the Commission approved that figure in preference to $515,432.04 proposed by the licensee. One Commissioner filed a concurring statement and one dissented. 9 F. P. C. 228. However, the Court of Appeals for the District of Columbia Circuit, one judge dissenting, upheld the licensee and remanded the case to the Commission with instructions to modify its order accordingly. 91 U. S. App. D. C. 395, 202 F. 2d 190.7 The decision turned primarily upon the court’s conclusion that neither the Federal Water Power Act nor the issuance of a license thereunder had abolished the licensee’s private proprietary rights to use the waters of Niagara River for power purposes. That issue was inescapable because the Commission, in computing the licensee’s required amortization reserve, had found that certain annual payments and discounts made by the [245]*245licensee for its use of private water rights, existing under state law, along the Niagara River, were not allowable expenses for the reason that the Commission considered those rights no longer existent. The Court of Appeals held precisely the contrary and we granted certiorari because of the important bearing of the. decision upon the Federal Water Power Act. 345 U. S. 955.
The immediate issue thus presented is whether the licensee’s amortization reserve under § 10 (d), for the period from March 2, 1941, through December 31, 1946, should be $914,432.04 or $515,432.04.8 That difference of $399,000 is one-half of the $798,000 which the Commission believes should be included in the surplus earnings of the licensee for the period. It consists of—
1. $577,500 paid by the licensee, at the rate of $99,000 a year, for its use, for power purposes, of 730 c. f. s. of the “International Paper water rights,” and
2. $220,500 allowed by the licensee as a discount, at the rate of $37,800 a year, on certain sales of electric power in consideration of permission to use, for power purposes, 262.6 c. f. s. of the “Pettebone-Cataract water rights.”
The Court of Appeals held that although respondent’s predecessor, in 1921, had received a federal license for this project, it nevertheless was justified in continuing to meet the financial obligations which it had assumed in return for permission to use water rights originally granted and still existing under the law of New York. That court, accordingly, approved each of the foregoing items of expense and fixed the licensee’s initial amortization reserve at $515,432.04.
It was not questioned in the Court of Appeals or here that the licensee originally had acquired, in return [246]*246for the above-stated payments and discounts, some kind or degree of private proprietary rights under the law of New York to use water from the Niagara River for power purposes. Accordingly, we do not consider it necessary to review here the intricate transactions which resulted in the above-described payments and discounts. We accept the conclusion of the Court of Appeals “that the International Paper and Pettebone-Cataract water rights are valid under the law of New York.” 91 U. S. App. D. C., at 406, 202 F. 2d, at 202.9 For further recognition of these water rights under state law, see Water Power & Control Commission v. Niagara Falls Power Co., 262 App. Div. 460, 30 N. Y. S. 2d 371, aff’d, 289 N. Y. 353, 45 N. E. 2d 907; Niagara Falls Power Co. v. Duryea, 185 Misc. 696, 57 N. Y. S. 2d 777.
Neither is it necessary for us to discuss the licensee’s expenses in 1947 or thereafter. They must be treated in the same way as those above mentioned, except to note that the discounts allowed in return for the Pettebone-Cataract water rights ceased with the licensee’s purchase of those rights in 1947. See 91 U. S. App. D. C., at 400-401, 202 F. 2d, at 196.
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Mr. Justice Burton
delivered the opinion of the Court.
The most significant issue raised by this case is whether the Federal Water Power Act of 19201 has abolished pri[241]*241vate proprietary rights, existing under state law, to use waters of a navigable stream for power purposes. We agree with the Court of Appeals that it has not. We agree also that in computing a federal licensee’s amortization reserve, required by § 10 (d) of that Act, as amended,2 the Federal Power Commission was not justified in disallowing the expenses paid or incurred by the licensee in this ease for the use of such rights.
March 2, 1921, Niagara Falls Power Company, a New York corporation, predecessor in interest of Niagara Mohawk Power Corporation, a New York corporation, respondent herein, secured from the Federal Power Commission the federal license with which we are concerned. It was the first such license issued under the Federal Water Power Act of 1920. Its term was 50 years. It authorized the diversion of water for power purposes from the Niagara River, above the Falls, and the return of it below the Falls, all in New York. The daily diversion, in the aggregate, could not exceed 19,500 cubic feet per second (c.f. s.).3
[242]*242Section 10 (d) of the Act requires each licensee, after 20 years of operation under such a license, to establish and maintain amortization reserves out of any surplus thereafter earned and accumulated in excess of a reasonable return upon the licensee’s net investment. Section 14 makes such net investment, plus severance damages, a principal measure of the price the Government is to pay when and if it takes over all or part of the property.4 [243]*243In 1942, the Commission expressly held that § 14 applied to this licensee.5
In 1947, Article 11 of the license was amended so as to specify a 6% rate of return and to require 50% of the licensee’s surplus earnings to be paid into its amortization reserves. As so amended, the article read:
“After the first twenty (20) years of operation of the project under this license, namely after March 1, 1941, six (6) per cent per annum shall be the specified rate of return on the net investment in the project for determining surplus earnings in accordance with the provisions of Section 10 (d) of the Act for the establishment and maintenance of amortization reserves to be held until termination of the license, or in the discretion of the Commission, to be applied from time to time in reduction of the net investment in the project, and one-half of all surplus earnings in excess of six (6) per cent per annum received in any calendar year shall be paid into and held in such amortization reserves.”6
[244]*244In 1948, the Commission began this proceeding to determine the licensee’s amortization reserve liability. It was the Commission’s first such effort under § 10 (d). In 1949, pursuant to a revised staff report, the Commission directed the holder of this license to show cause why one-half of its surplus earnings from March 2, 1941, through December 31, 1946, in the amount of $994,521.33, should not be set aside in an amortization reserve, and why a like proportion of its subsequent surplus earnings should not be set aside annually upon a comparable basis. In 1950, the Commission’s presiding examiner recommended that the licensee’s initial reserve be $914,432.04, and the Commission approved that figure in preference to $515,432.04 proposed by the licensee. One Commissioner filed a concurring statement and one dissented. 9 F. P. C. 228. However, the Court of Appeals for the District of Columbia Circuit, one judge dissenting, upheld the licensee and remanded the case to the Commission with instructions to modify its order accordingly. 91 U. S. App. D. C. 395, 202 F. 2d 190.7 The decision turned primarily upon the court’s conclusion that neither the Federal Water Power Act nor the issuance of a license thereunder had abolished the licensee’s private proprietary rights to use the waters of Niagara River for power purposes. That issue was inescapable because the Commission, in computing the licensee’s required amortization reserve, had found that certain annual payments and discounts made by the [245]*245licensee for its use of private water rights, existing under state law, along the Niagara River, were not allowable expenses for the reason that the Commission considered those rights no longer existent. The Court of Appeals held precisely the contrary and we granted certiorari because of the important bearing of the. decision upon the Federal Water Power Act. 345 U. S. 955.
The immediate issue thus presented is whether the licensee’s amortization reserve under § 10 (d), for the period from March 2, 1941, through December 31, 1946, should be $914,432.04 or $515,432.04.8 That difference of $399,000 is one-half of the $798,000 which the Commission believes should be included in the surplus earnings of the licensee for the period. It consists of—
1. $577,500 paid by the licensee, at the rate of $99,000 a year, for its use, for power purposes, of 730 c. f. s. of the “International Paper water rights,” and
2. $220,500 allowed by the licensee as a discount, at the rate of $37,800 a year, on certain sales of electric power in consideration of permission to use, for power purposes, 262.6 c. f. s. of the “Pettebone-Cataract water rights.”
The Court of Appeals held that although respondent’s predecessor, in 1921, had received a federal license for this project, it nevertheless was justified in continuing to meet the financial obligations which it had assumed in return for permission to use water rights originally granted and still existing under the law of New York. That court, accordingly, approved each of the foregoing items of expense and fixed the licensee’s initial amortization reserve at $515,432.04.
It was not questioned in the Court of Appeals or here that the licensee originally had acquired, in return [246]*246for the above-stated payments and discounts, some kind or degree of private proprietary rights under the law of New York to use water from the Niagara River for power purposes. Accordingly, we do not consider it necessary to review here the intricate transactions which resulted in the above-described payments and discounts. We accept the conclusion of the Court of Appeals “that the International Paper and Pettebone-Cataract water rights are valid under the law of New York.” 91 U. S. App. D. C., at 406, 202 F. 2d, at 202.9 For further recognition of these water rights under state law, see Water Power & Control Commission v. Niagara Falls Power Co., 262 App. Div. 460, 30 N. Y. S. 2d 371, aff’d, 289 N. Y. 353, 45 N. E. 2d 907; Niagara Falls Power Co. v. Duryea, 185 Misc. 696, 57 N. Y. S. 2d 777.
Neither is it necessary for us to discuss the licensee’s expenses in 1947 or thereafter. They must be treated in the same way as those above mentioned, except to note that the discounts allowed in return for the Pettebone-Cataract water rights ceased with the licensee’s purchase of those rights in 1947. See 91 U. S. App. D. C., at 400-401, 202 F. 2d, at 196.
We are not required to determine the nature of the rights claimed by respondent except to recognize that they are usufructuary rights to use the water for the generation of power, as distinguished from claims to the legal ownership of the running water itself. They are rights to use the force of the fall of the water, coupled with an obliga[247]*247tion to return the water to the river under specified conditions.10 The rights under consideration originally were attached to riparian lands above and below the Falls. However, they long have been separated from such lands and, thus separated, they have been transferred or leased to respondent. Under the law of New York, they constitute a form of real estate known as corporeal heredita-ments.11 The Commission does not now contest the pur[248]*248chase prices which have been paid for any of these rights. The Commission’s present objection is limited to respondent’s deduction, in the computation of its amortization reserves, of the annual payments and discounts it has made and which it proposes to make for the use of such rights. The Commission contends (1) that Congress not only may constitutionally abolish such local water rights without compensation but that it already has done so, and (2) that, although the licensee’s contested expenditures may be lawful, or even obligatory, between the parties, they must be disallowed in computing the licensee’s amortization reserve under § 10 (d).
We conclude, as did the Court of Appeals, that, even though respondent’s water rights are of a kind that is within the scope of the Government’s dominant servitude, the Government has not exercised its power to abolish them.12
[249]*249While we recognize the dominant servitude, in favor of the United States, under which private persons hold physical properties obstructing navigable waters of the United States and all rights to use the waters of those streams,13 we recognize also that the exercise of that servitude, without making allowances for preexisting rights under state law, requires clear authorization. A classic example of such a clear authorization appears in United States v. Chandler-Dunbar Co., 229 U. S. 53. The Act of March 3, 1909, there authorized the exercise of the dominant right of the United States to take all of a navigable river’s flow for purposes of interstate commerce. It did so in explicit terms. It said:
“Sec. 11. . . . the ownership in fee simple absolute by the United States of all lands and property of every kind and description north of the present Saint Marys Falls Ship Canal throughout its entire length and lying between said ship canal and the [250]*250international boundary line at Sault Sainte Marie, in the State of Michigan, is necessary for the purposes of navigation of said waters and the waters connected therewith.
“The Secretary of War is hereby directed to take proceedings immediately for the acquisition by condemnation or otherwise of all of said lands and property of every kind and description, in fee simple absolute. . . .
“Every permit, license, or authority of every kind, nature, and description heretofore issued or granted by the United States, or any official thereof, to the Chandler-Dunbar Water Power Company . . . shall cease and determine and become null and void on January first, nineteen hundred and eleven . . . 35 Stat. 820, 821.
In that case the Government took the entire flow of the stream exclusively for purposes of interstate commerce. The Court accordingly recognized the Government’s absolute right, within the bed of the stream, to use all of the waters flowing in the stream, for purposes of interstate commerce, without compensating anyone for the use of those waters.14
That decision is not applicable here. The issue here is whether the much more general and regulatory language of the Federal Water Power Act shall be given the same drastic effect as was required there by the language of the Act of March 3, 1909. We find nothing in the Federal Water Power Act justifying such an interpretation. Neither it, nor the license issued under it, expressly [251]*251abolishes any existing proprietary rights to use waters of the Niagara River. Unlike the statute in the Chandler-Dunbar case, the Federal Water Power Act mentions no specific properties. It makes no express assertion of the paramount right of the Government to use the flow of the Niagara or of any other navigable stream to the exclusion of existing users. On the contrary, the plan of the Act is one of reasonable regulation of the use of navigable waters, coupled with encouragement of their development as power projects by private parties.15
The Act—
“discloses both a vigorous determination of Congress to make progress with the development of the long idle water power resources of the Nation and a determination to avoid unconstitutional invasion of the jurisdiction of the States. . . .
“The Act leaves to the States their traditional jurisdiction subject to the admittedly superior right of the Federal Government, through Congress, to regulate interstate and foreign commerce . . . .” First Iowa Cooperative v. Federal Power Commission, 328 U. S. 152, 171.
The Act treats usufructuary water rights like other property rights. While leaving the way open for the exercise of the federal servitude and of federal rights of purchase or condemnation, there is no purpose expressed [252]*252to seize, abolish or eliminate water rights without compensation merely by force of the Act itself.16
The references in the Act to preexisting water rights carry a natural implication that those rights are to survive, at least until taken over by purchase or otherwise.17 Riparian water rights, like other real property rights, are determined by state law. Title to them is acquired in conformity with that law. The Federal Water Power Act merely imposes upon their owners the additional obligation of using them in compliance with that Act.
The legislative history of the Act discloses no substantial support for the drastic policy which the Commission seeks to read into it. To convert this Act from a regulatory Act to one automatically abolishing preexisting [253]*253water rights on a nationwide scale calls for a convincing explanation of that purpose. We find none. In fact, the legislative history points the other way. Representative William L. La Follette, of Washington, a member of the House Special Committee on Water Power which reported substantially the same bill as that which in 1920 became the Federal Water Power Act, said of it in 1918:
“This bill is not based on either the Government’s ownership or its sovereign authority, but on the hypothesis that we as representatives of the States have authority to act for the States in matters of this character and pass laws for the general good, by the establishment of a limited trusteeship or commission composed of officials of the Government, to carry out and administer this law in such a way as not to infringe any of the rights of the States nor to impede or restrict navigation, but rather to benefit it. . . . Under this bill we only allow the commission a supervisory power over those functions entirely within the State’s jurisdiction for the period covered by any license, the State having exercised its rights in advance of issue.” 56 Cong. Rec. 9110.
Shortly thereafter he added:
“If we put in this language [of §9 (b)], which is practically taken from that Supreme Court decision [United States v. Cress, 243 U. S. 316], as to the property rights of the States as to the bed and the banks and to the diversion of the water, then it is sure that we have not infringed any of the rights of the States in that respect, or any of their rules of property .... We are earnestly trying not to infringe the rights of the States.” Id., at 9810.18
[254]*254In 1930, this Court passed upon the basic question now before us when it came here in a different connection. In Ford & Son v. Little Falls Co., 280 U. S. 369, Mr. Justice Stone, writing for a unanimous Court, held that a riparian owner of a right to use water for power purposes in the navigable Mohawk River, in New York State, was entitled to an injunction against the uncompensated destruction of that right by a subsequent licensee under the Federal Water Power Act. The New York Supreme Court had granted such an injunction and awarded damages. This Court affirmed that decision, although the federal license then before the Court had authorized the licensee to raise the navigable waters of the Hudson River to such an extent that they would destroy the value of the riparian owner’s right, under state law, to use the fall of tributary waters of the Mohawk for power purposes. It was thus held that the Federal Water Power Act had not abolished the complainant’s private proprietary water rights, existing under New York law, to use navigable waters for power purposes.19
“[E]ven though the rights which the respondents [the riparian owners] 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 [255]*255to impair such rights recognized by state law without compensation.” Id., at 377.
After quoting from §§10 (c) (liability for damages caused by the licensed project), 27 (saving clause as to proprietary rights under state law), 21 (condemnation rights) and 6 (licensee’s acceptance of the conditions of the Act), the Court added:
“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 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 [the licensee], by acceptance of the license under the provisions of § 6, must be deemed to have agreed to recognize and protect.” Id., at 378-379.
Parallel reasoning has been applied in a case involving a conflict between a licensee and the holder of state-recognized rights to use water from a navigable stream for irrigation purposes. United States v. Gerlach Live Stock Co., 339 U. S. 725, 734. See also, as to state-created water rights for power purposes, Grand River Dam Authority v. Grand-Hydro, 335 U. S. 359, 372; Pike Rapids Power Co. v. Minneapolis, St. P. & S. S. M. R. Co., 99 F. 2d 902; United States v. Central Stockholders’ Corp., 52 F. 2d 322; Rank v. Krug, 90 F. Supp. 773, 793; Great [256]*256Northern R. Co. v. Washington Electric Co., 197 Wash. 627, 86 P. 2d 208.
In First Iowa Cooperative v. Federal Power Commission, 328 U. S. 152, at 175-176, § 27 of the Act was discussed in relation to conditions controlling the approval of projects. The language there used is applicable to proprietary water rights for power purposes as well as those for other proprietary uses. To any extent that statements in Alabama Power Co. v. Gulf Power Co., 283 F. 606, cited in the First Iowa case, indicate a different interpretation, they are not controlling.
Respondent’s private property rights are rooted in state law, subject to the paramount rights of the State and Nation. In the instant case, both the State and the Nation have made limited assertions of their superior rights. New York has done so through its rental charges and the Nation through its license. Neither, however, has laid claim to such an exclusive right to the waters as eliminates the limited use which respondent here seeks to make of them.
The findings of the Commission and the action of the Court of Appeals disclose no sufficient additional circumstances demonstrating the unreasonableness of the expenses in question.20
The judgment of the Court of Appeals, accordingly, is
Affirmed.
Me. Justice Reed withdrew from the consideration and decision of this case.
Mr. Justice Jackson took no part in the consideration or decision of this case.
[For dissenting opinion, see p. 258.]
[257]*257