Cite as: 531 U. S. 159 (2001)
Opinion of the Court
late wetlands adjacent to "navigable waters," respondents point us to no persuasive evidence that the House bill was proposed in response to the Corps' claim of jurisdiction over nonnavigable, isolated, intrastate waters or that its failure indicated congressional acquiescence to such jurisdiction.
Section 404(g) is equally unenlightening. In Riverside Bayview Homes we recognized that Congress intended the phrase "navigable waters" to include "at least some waters that would not be deemed 'navigable' under the classical understanding of that term." Id., at 133. But § 404(g) gives no intimation of what those waters might be; it simply refers to them as "other . . . waters." Respondents conjecture that "other . . . waters" must incorporate the Corps' 1977 regulations, but it is also plausible, as petitioner contends, that Congress simply wanted to include all waters adjacent to "navigable waters," such as nonnavigable tributaries and streams. The exact meaning of § 404(g) is not before us and we express no opinion on it, but for present purposes it is sufficient to say, as we did in Riverside Bayview Homes, that "§ 404(g)(1) does not conclusively determine the construction to be placed on the use of the term 'waters' elsewhere in the Act (particularly in § 502(7), which contains the relevant definition of 'navigable waters') . . . ." Id., at 138, n. 11.7
We thus decline respondents' invitation to take what they see as the next ineluctable step after Riverside Bayview Homes: holding that isolated ponds, some only seasonal, wholly located within two Illinois counties, fall under § 404(a)'s definition of "navigable waters" because they serve
7 Respondents also make a passing reference to Congress' decision in 1977 to exempt certain types of discharges from § 404(a), including, for example, "discharge of dredged or fill material . . . for the purpose of construction or maintenance of farm or stock ponds or irrigation ditches, or the maintenance of drainage ditches." § 67, 91 Stat. 1600, 33 U. S. C. § 1344(f)(C). As § 404(a) only regulates dredged or fill material that is discharged "into navigable waters," Congress' decision to exempt certain types of these discharges does not affect, much less address, the definition of "navigable waters."
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