From the enactment of the National Park Service Organic Act (the Organic Act or the Act) in 1916 until a 1998 decision by a federal district court in Utah, the National Park Service (NPS) had managed national parks without resolving theseeming contradiction between the Act's directive to conserve park resources "unimpaired" and its simultaneous directive to provide for visitors' "enjoyment" of those resources. Uncertainty, confusion, and disputes about the inevitably conflicting implications of these mandates were virtually guaranteed by the text of the Act, which requires the NPS to—

Our magnificent 40,000-mile National Trails System was established by Congress under the National Trails System Act (NTSA) of 1968 through the combined efforts of President Lyndon Johnson, Secretary of the Interior Stewart Udall, and Sens. Henry M. Jackson (D-Wash.) and Gaylord Nelson (D-Wis.). Private and nonfederal public lands make up the lion's share of federally recognized long-distance trail corridors.

"In the ranchers' view, history has created expectations in respect to the security of 'grazing privileges'; they have relied upon those expectations; and the statute requires the Secretary to 'safeguard' that reliance."

"Their adamance derives from a recollection of history that never existed and from asserted promises that were never made."

Editors' Summary: This Article addresses the effect of the U.S. Constitution's Takings Clause on the government's authority to protect environmental resources. An earlier Article, published in the May 1994 of ELR, analyzed bases for government regulation provided by limitations inherent in the property right itself. In contrast, this Article focuses on an emerging doctrine of sustainable use, rooted in background principles of nuisance law and the government's complementary police power.