{"data":{"id":"us/40-cfr-81.417","jurisdiction":"us","citation":"40 CFR 81.417","heading":"Montana.","body":"Area name Acreage Public Law establishing Federal land manager\nAnaconda-Pintlar Wild 157,803 88-577 USDA-FS\nBob Marshall Wild 950,000 88-577 USDA-FS\nCabinet Mountains Wild 94,272 88-577 USDA-FS\nGates of the Mtn Wild 28,562 88-577 USDA-FS\nGlacier NP 1,012,599 61-171 USDI-NPS\nMedicine Lake Wild 11,366 94-557 USDI-FWS\nMission Mountain Wild 73,877 93-632 USDA-FS\nRed Rock Lakes Wild 32,350 94-557 USDI-FWS\nScapegoat Wild 239,295 92-395 USDA-FS\nSelway-Bitterroot Wild 1 251,930 88-577 USDA-FS\nU. L. Bend Wild 20,890 94-557 USDI-FWS\nYellowstone NP 2 167,624 (3) USDI-NPS\n1 Selway-Bitterroot Wilderness, 1,240,700 acres overall, of which 988,770 acres are in Idaho and 251,930 acres are in Montana.\n2 Yellowstone National Park, 2,219,737 acres overall, of which 2,020,625 acres are in Wyoming, 167,624 acres are in Montana, and 31,488 acres are in Idaho.\n3 17 Stat. 32 (42nd Cong.)","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES","Subpart D—Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"b0908b9b9c2dacd97082e73517a0adf485d67b76c0ecd122f64966434d0d202f","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-81.416","next":"us/40-cfr-81.418"},"notice":"GroundRules: Original legal text. Not legal advice."}