Cite as: 535 U. S. 302 (2002)
Opinion of the Court
tion, jurisdiction over the Basin, which occupies 501 square miles, was shared by the States of California and Nevada, five counties, several municipalities, and the Forest Service of the Federal Government. In 1968, the legislatures of the two States adopted the Tahoe Regional Planning Compact, see 1968 Cal. Stats. no. 998, p. 1900, § 1; 1968 Nev. Stats. p. 4, which Congress approved in 1969, Pub. L. 91-148, 83 Stat. 360. The compact set goals for the protection and preservation of the lake and created TRPA as the agency assigned "to coordinate and regulate development in the Basin and to conserve its natural resources." Lake Country Estates, Inc. v. Tahoe Regional Planning Agency, 440 U. S. 391, 394 (1979).
Pursuant to the compact, in 1972 TRPA adopted a Land Use Ordinance that divided the land in the Basin into seven "land capability districts," based largely on steepness but also taking into consideration other factors affecting runoff. Each district was assigned a "land coverage coefficient—a recommended limit on the percentage of such land that could be covered by impervious surface." Those limits ranged from 1% for districts 1 and 2 to 30% for districts 6 and 7. Land in districts 1, 2, and 3 is characterized as "high hazard" or "sensitive," while land in districts 4, 5, 6, and 7 is "low hazard" or "non-sensitive." The SEZ lands, though often treated as a separate category, were actually a subcategory of district 1. 34 F. Supp. 2d, at 1232.
Unfortunately, the 1972 ordinance allowed numerous exceptions and did not significantly limit the construction of new residential housing. California became so dissatisfied with TRPA that it withdrew its financial support and uni-laterally imposed stricter regulations on the part of the Basin located in California. Eventually the two States, with the approval of Congress and the President, adopted an extensive amendment to the compact that became effective on December 19, 1980. Pub. L. 96-551, 94 Stat. 3233; Cal.
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