The Macon County Conservation District (MCCD) is a public park authority, created in 1966, serving the metropolitan area of Decatur in the U.S. state of Illinois. The conservation district operates five conservation areas and six historic sites, as of 2022, throughout Macon County. Facilities include the park district's flagship open space, Rock Springs Conservation Area; a nature center within the Conservation Area, the Rock Springs Nature Center; and an Illinois State Natural Area, the Bois du Sangamon by Lake Decatur.