US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 81 — DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSESSubpart D — Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value81.40140 C.F.R. § 81.401Alabama.Last amended: 2016Year: 2026Length: 14 wordsOfficial source Cite as 40 C.F.R. § 81.401 (2026)Area name Acreage Public Law establishing Federal land manager Sipsey Wild 12,646 93-622 USDA-FSPrevious40 C.F.R. § 81.400Next40 C.F.R. § 81.402