Opinion by Judge THOMPSON; Dissent by Judge TROTT.

Chinook salmon and steelhead trout are anadromous fish. 1 They are an important natural resource, exploited by commercial, sport and Indian tribal fishermen fishing in the Columbia and Salmon River Basins and in the Pacific Ocean from Oregon, California, Washington, Alaska and British Columbia.

Anadromous fish spawn, among other places, in tributaries of the Salmon River. One such tributary is Allison Creek, a non-navigable body of water. In 1955, Guy M. Carlson built a small hydroelectric project on Allison Creek next to his property. The project generates a modest amount of electricity which is wholly consumed on Carlson’s property and used for his ranch house and outbuildings. The project’s dam, a 3-foot-high structure, blocks the migration of ana-dromous fish, preventing them from spawning in the portion of Allison Creek above the dam.

In 1985, Carlson filed with the Federal Energy Regulatory Commission (FERC) a declaration of intention to continue operating his hydroelectric project. FERC requires such a declaration in connection with its investigation and determination whether a project requires a license under § 23(b)(1) of the Federal Power Act (the Act), 16 U.S.C. § 817 (1). Section 23(b)(1) directs the Commission to

If FERC concludes a license is required under § 23(b), a necessary condition of the license is that the project “be best adapted to a comprehensive plan ... for the adequate protection, mitigation, and enhancement of fish and wildlife (including related spawning grounds and habitat)_” 16 U.S.C. § 803 .

After conducting an investigation, the Director of FERC’s Office of Hydropower Licensing issued an order that the project did not require a license because it did not occupy public lands, did not use surplus water or water power from a federal dam, and no power generated by the project was transported across state lines or fed into an interstate power system.

The Department of Commerce, the Nez Perce Tribe, the National Wildlife Federation and the Idaho Wildlife Federation (“Petitioners”) appealed the order to FERC. *895 They argued that Carlson’s project required a license because of its impact on the spawning of anadromous fish, an impact that affected “the interests of interstate or foreign commerce” within the meaning of § 23(b)(1) of the Act. FERC rejected this argument by a 3-to-2 vote, holding that a project’s effect on anadromous fish, even though it may affect interstate or foreign commerce, can never provide the basis for FERC’s licensing jurisdiction. Guy M. Carlson, 62 FERC ¶ 61,009 (1993). FERC also held, “Even assuming, arguendo, that FERC could assert mandatory jurisdiction based on a project’s effect on anadromous fisheries, the effect of the Carlson project on the anadromous fishery is too insubstantial to constitute such an effect.” Id. Petitioners petition for review of these determinations.

We have jurisdiction under 16 U.S.C. § 8251 (b). We grant review, vacate FERC’s order, and remand for further proceedings.

Petitioners argue that FERC erroneously restricted the breadth of its licensing jurisdiction under § 23(b)(1), because that section gives it licensing jurisdiction whenever a project covered by the Act affects interstate or foreign commerce.

FERC argues for a restrictive interpretation of § 23(b)(1). Under its interpretation, a project affects interstate or foreign commerce only if it affects the navigable capacity of a waterway or if the project generates power for interstate transmission. We find no such limitation in the plain language of the Act.

The Supreme Court’s analysis in FPC v. Union Elec. Co., 381 U.S. 90 , 85 S.Ct. 1253 , 14 L.Ed.2d 239 (1965), popularly known as the Taum Sauk opinion, is instructive. There the Court considered the issue whether the Federal Power Commission’s (FPC) 2 jurisdiction under the Act was limited to projects that affect navigable capacity or whether FPC could also exercise its jurisdiction based on a project’s interstate transmission of power. The Court held FPC could exercise its licensing jurisdiction over the Taum Sauk project based solely on the project’s interstate transmission of power. In reaching this holding, the Court reasoned,

Id. at 101, 85 S.Ct. at 1259-60 (internal quotations and citations omitted, emphasis added). Addressing the argument that jurisdiction should be limited to those projects that would affect navigation, the Taum Sauk Court stated:

Id. at 107, 85 S.Ct. at 1263 .

FERC argues this language from Taum Sauk is unnecessarily broad. It urges us to restrict the language of Taum Sauk to the precise facts of that case, and to read its holding as limiting FERC’s exercise of jurisdiction only when a project on a non-navigable waterway affects the interstate transmission of power. We decline to do so. Not only is the broad language of Taum Sauk instructive, 3 the plain language of the Act *896 compels the conclusion that FERC has jurisdiction to license Carlson’s project.

The Act grants FERC licensing jurisdiction “if upon investigation it shall find that the interests of interstate or foreign commerce would be affected by” the construction, maintenance or operation of “a dam or other project works across, along, over, or in any stream or part thereof ... over which Congress has jurisdiction under its authority to regulate commerce with foreign nations and among the several states.” Section 23(b)l of the Federal Power Act, 16 U.S.C. § 817 (1). This language does not limit licensing to some specified projects affecting interstate or foreign commerce. As the Court in Taum Sauk reasoned, it is “of compelling significance that the Congress adopted comprehensive language and refrained from writing any limitation or reference to [navigation in Taum Sauk, interstate transmission of power here] into § 23(b).” Taum Sauk, 381 U.S. at 107 , 85 S.Ct. at 1263 .

It is undisputed that the commerce powers of Congress extend to the protection of spawning of anadromous fish from the Columbia River Basin, a basin fed in part by the Allison Creek tributary. Nor is there any dispute that Carlson’s dam prevents the spawning of anadromous fish in the portion of Allison Creek above the dam. Moreover, it cannot be denied that the loss of spawning habitat has depleted the stock of anadromous fish in the Columbia River Basin, and that this has had an impact on interstate and foreign commerce.

FERC argues, however, that notwithstanding any effect the Carlson project may have on interstate or foreign commerce, we should uphold FERC’s interpretation of the Act because we are required to give that interpretation deference under Chevron U.S.A., Inc. v. Natural Resources Defense Council, 467 U.S. 837, 842-845 , 104 S.Ct. 2778, 2781-2783 , 81 L.Ed.2d 694 (1984). We disagree. Such deference is due only when a statute is ambiguous and when Congress has not expressed any intent on the issue before the court. Id. at 844-45 , 104 S.Ct. at 2782-83 . Here, the language setting forth the Act’s jurisdictional reach is not ambiguous; and the Supreme Court has determined Congress intended in passing the Act to invoke its full Commerce Clause powers. Taum Sauk, 381 U.S. at 96, 101, 107 , 85 S.Ct. at 1257, 1259, 1262 .

Finally, FERC presents a floodgates argument. It contends if we interpret its jurisdiction under the Act to extend beyond projects that affect navigation or transmit power interstate, we will bring within its licensing requirements an enormous number of projects never intended to be subjected to its licensing jurisdiction. We reject this argument. Congress, not this court, has determined the scope of FERC’s licensing jurisdiction. It is not our place to question that legislative determination. Moreover, FERC’s concern is overstated. Only those projects that have a “real and substantial” impact on interstate or foreign commerce need be licensed. City of Centralia v. FERC, 661 F.2d 787, 791 (9th Cir.1981).

Here, FERC concluded that even if it could assert jurisdiction over Carlson’s project, the effect of the project on the anadro-mous fishery was “too insubstantial” to affect interstate or foreign commerce. Petitioners challenge this conclusion.

We have carefully reviewed the record. There was substantial evidence presented to FERC to support a determination that Carlson’s project has a substantial impact on anadromous fish, affecting commercial, recreational and tribal fishing interests in the Columbia River Basin and the Pacific Ocean. It appears FERC did not fully consider this evidence. Moreover, all parties agree that if we should hold, as we do, that FERC has licensing jurisdiction over Carlson’s project, this case should be remanded to FERC for development of a complete record on the question whether the impact of Carlson’s project is “too insubstantial” to affect commerce. See City of Centralia, 661 F.2d at 792-93 . We will do as the parties ask.

The petitioners’ petition for review is GRANTED. FERC’s order determining that it lacks licensing jurisdiction over the Carlson project is VACATED. This case is REMANDED to FERC for further proceed *897 ings to determine whether the Carlson project has too insubstantial an effect on interstate or foreign commerce to require licensing under the Act.

Review GRANTED. Order VACATED. Case REMANDED.

. Anadromous fish are "[a]quatic, gill-breathing, vertebrate animals bearing paired fins which migrate to and spawn in fresh water, but which spend part of their life in an oceanic environment; also fish in the Great Lakes that ascend streams to spawn.” 50 C.F.R. § 401.2 (g).

. The Federal Power Commission was the predecessor to FERC.

. “See United States v. LaBinia, 614 F.2d 1207, 1210 (9th Cir.1980) (unless the Supreme Court expressly limits its opinion to the facts before it, it is the principle which controls and not the specific facts upon which the principle was decided).” United States v. Underwood, 717 F.2d 482, 486 (9th Cir.1983).