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the Corps that the statute required it "to protect water quality to the full extent of the [C]ommerce [C]lause" and to extend federal regulation over discharges "to many areas that have never before been subject to Federal permits or to this form of water quality protection." 40 Fed. Reg. 31320 (1975).
In 1975, the Corps therefore adopted the interim regulations that we upheld in Riverside Bayview. As we noted in that case, the new regulations understood "the waters of the United States" to include, not only navigable waters and their tributaries, but also "nonnavigable intrastate waters whose use or misuse could affect interstate commerce." 474 U. S., at 123. The 1975 regulations provided that the new program would become effective in three phases: phase 1, which became effective immediately, encompassed the navigable waters covered by the 1974 regulation and the RHA; phase 2, effective after July 1, 1976, extended Corps jurisdiction to nonnavigable tributaries, freshwater wetlands adjacent to primary navigable waters, and lakes; and phase 3, effective after July 1, 1977, extended Corps jurisdiction to all other waters covered under the statute, including any waters not covered by phases 1 and 2 (such as "intermittent rivers, streams, tributaries, and perched wetlands that are not contiguous or adjacent to navigable waters") that "the District Engineer determines necessitate regulation for the protection of water quality." 40 Fed. Reg. 31325-31326 (1975). The final version of these regulations, adopted in 1977, made clear that the covered waters included "isolated lakes and wetlands, intermittent streams, prairie potholes, and other waters that are not part of a tributary system to interstate waters or to navigable waters of the United States, the degradation or destruction of which could affect interstate commerce." 12
12 42 Fed. Reg. 37127 (1977), as amended, 33 CFR § 328.3(a)(3) (1977). The so-called "migratory bird" rule, upon which the Corps based its assertion of jurisdiction in this case, is merely a specific application of the more general jurisdictional definition first adopted in the 1975 and 1977
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