Cite as: 503 U. S. 569 (1992)
Opinion of the Court
effects upon water quality, recreation, fish and wildlife, pollution, our natural resources, as well as the effects on navigation." 33 CFR § 209.330(a).6
Yet even after the Corps adopted this more expansive reading, which the language of the statute and our decisions interpreting it plainly authorized, the House Committee on Government Operations nevertheless concluded that the Corps in practice was still not interpreting its statutory authority broadly enough. See H. R. Rep. No. 91-917, p. 6 (1970). The Committee was of the view that the Corps' earlier "restricted view of the 1899 act . . . was not required by the law." Id., at 2. The Report summarized our holdings to the effect that the statutory language of RHA § 10 should be interpreted generously, id., at 2-4, and commended the Corps "for recognizing [in 1968] its broader responsibilities" pursuant to its permitting authority under the RHA, id., at 5. The Committee emphasized that the Corps "should instruct its district engineers . . . to increase their emphasis on how the work will affect all aspects of the public interest, including not only navigation but also conservation of natural resources, fish and wildlife, air and water quality, esthetics, scenic view, historic sites, ecology, and other public interest aspects of the waterway." Id., at 6 (emphasis added). The Corps did not react to this "advice" until after the Fifth Circuit's decision in Zabel v. Tabb, 430 F. 2d 199 (1970). There the court upheld the Corps' consideration of environmental factors in its permitting decision even though the project would not interfere with navigation, flood control, or power production. After this decision, the Corps began the long process of changing its regulations governing permit application evaluations. See 42 Fed. Reg. 37122 (1977) (describing historical background of the agency's practice). In 1976, the Corps issued regulations interpreting its statutory authority
6 The prior version of this regulation stated that "[t]he decision as to whether a permit will be issued must rest primarily upon the effect of the proposed work on navigation." 33 CFR § 209.330(a) (1967).
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