Statute treatment: 40 C.F.R. § 1500

Ranked leading cases interpreting this statute, drawn from 131 citation events across 111 distinct cases.

131citations total

111distinct interpreting cases

44distinct courts

10citations in last 5y

1974–2026year range

Top 20 leading cases

#1 Sierra Club v. Brock Adams, Jr., Secretary of Transportation of the U.S., and William M. Cox, Administrator, Federal Highway Administration (1978) cadc 42 own cites 2× in case

#2 California v. Block (1982) ca9 308 own cites 3× in case

#3 Colorado Environmental Coalition v. Dombeck (1999) ca10 131 own cites 1× in case

#4 Custer County Action Ass'n v. Garvey (2001) ca10 121 own cites 1× in case

#5 Sierra Club v. John O. Marsh, Jr. (1985) ca1 106 own cites 1× in case

#6 River Road Alliance, Inc. v. Corps of Engineers of United States Army, National Marine Service Inc., Defendant-Intervenor-Appellant (1985) ca7 95 own cites 1× in case

#7 Sierra Club and William O'Neil v. John O. Marsh, Jr. (1992) ca1 86 own cites 1× in case

#8 Sierra Club, a Corporation v. Robert F. Froehlke, Secretary of the Army (1976) ca8 78 own cites 1× in case

#9 Friends of the Bow v. Thompson (1997) ca10 77 own cites 1× in case

#10 The Fund for Animals, a Corporation of the State of New York v. Kent Frizzell, Secretary of the United States Department of the Interior (1976) cadc 69 own cites 1× in case

#11 Minnesota Public Interest Research Group and Sierra Club v. Earl v. Butz, Individually and as Secretary of Agriculture,appellants (1976) ca8 68 own cites 1× in case

#12 Minnesota Public Interest Research Group v. Butz (1975) mnd 6 own cites 4× in case

#13 Philadelphia Council of Neighborhood Organizations v. Coleman (1977) paed 14 own cites 2× in case

#14 Sierra Club v. John S. Hassell, Jr., Etc. (1981) ca5 43 own cites 1× in case

#15 Utah Shared Access Alliance v. United States Forest Service (2002) ca10 43 own cites 1× in case

#16 cluster 480598 (1986) ca7 43 own cites 1× in case

#17 Natural Resources Defense Council, Inc. v. Morton (1974) dcd 42 own cites 1× in case

#18 Colón Cortés v. Pesquera (2000) prsupreme 41 own cites 1× in case

#19 cluster 446898 (1985) cadc 41 own cites 1× in case

#20 Sierra Club v. Cecil D. Andrus, Secretary of the Interior and James T. Lynn, Director of Office of Management and Budget (1978) cadc 41 own cites 1× in case

Ranking method: leading_score = ln(1 + own_citation_count) × √(mentions_in_case) × flag_factor, where flag_factor = 1.0 green · 0.6 unknown · 0.5 neutral · 0.4 yellow · 0.3 procedural · 0 red. Red-flagged cases excluded — their interpretation has been undermined and shouldn't lead the list. Top 20 returned per statute. Open any case for full G Cite, trajectory, and per-circuit treatment.