Cite as: 535 U. S. 302 (2002)
Opinion of the Court
manent plans that TRPA adopted thereafter will clarify the narrow scope of our holding.
I
The relevant facts are undisputed. The Court of Appeals, while reversing the District Court on a question of law, accepted all of its findings of fact, and no party challenges those findings. All agree that Lake Tahoe is "uniquely beautiful," 34 F. Supp. 2d 1226, 1230 (Nev. 1999), that President Clinton was right to call it a " 'national treasure that must be protected and preserved,' " ibid., and that Mark Twain aptly described the clarity of its waters as " 'not merely transparent, but dazzlingly, brilliantly so,' " ibid. (emphasis added) (quoting M. Twain, Roughing It 174-175 (1872)).
Lake Tahoe's exceptional clarity is attributed to the absence of algae that obscures the waters of most other lakes. Historically, the lack of nitrogen and phosphorous, which nourish the growth of algae, has ensured the transparency of its waters.2 Unfortunately, the lake's pristine state has deteriorated rapidly over the past 40 years; increased land development in the Lake Tahoe Basin (Basin) has threatened the " 'noble sheet of blue water' " beloved by Twain and countless others. 34 F. Supp. 2d, at 1230. As the District Court found, "[d]ramatic decreases in clarity first began to be noted in the late 1950's/early 1960's, shortly after development at the lake began in earnest." Id., at 1231. The lake's unsurpassed beauty, it seems, is the wellspring of its undoing.
2 According to a Senate Report: "Only two other sizable lakes in the world are of comparable quality—Crater Lake in Oregon, which is protected as part of the Crater Lake National Park, and Lake Baikal in the [former] Soviet Union. Only Lake Tahoe, however, is so readily accessible from large metropolitan centers and is so adaptable to urban development." S. Rep. No. 91-510, pp. 3-4 (1969).
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