Ozark–St. Francis National Forest  The Ozark – St. Francis National Forest is a United States National Forest that is located in the state of Arkansas. It is composed of two separate forests, Ozark National Forest in the Ozark Mountains; and St. Francis National Forest on Crowley's Ridge. Each forest has distinct biological, topographical, and geological differences. Together, the two forests are home to 23 developed campgrounds, and include nine swimming areas, of hiking trails, and of streams for fishing. The majority of the trails in what are now the Ozark National Forest and St. Francis National Forest were constructed under the Works Progress Administration (WPA) and Civilian Conservation Corps (CCC). The Forest contains of old-growth forests. The old-growth forests typically occur in the southern portion of the Forest on ridges and steep south-facing slopes and are dominated by Shortleaf Pine and various oaks, including Post Oak, Blackjack Oak, Eastern Black Oak, White Oak, and Northern Red Oak. The Forest is also home to six different endangered species. Several National Scenic Byways cross the Ozark–St. Francis National Forest, including the Scenic 7 Byway which runs from Missouri to Louisiana, of which are within the Ozark National Forest. Scenic 7 Byway offers the greatest variety of Ozark topography and scenic vistas. The Ozark Highlands Byway provides access to the Mulberry River, Big Piney Creek, and Buffalo National River for fisherman and canoeists. The Mount Magazine Byway offers scenic overlooks of the Arkansas River Valley, and the Sylamore Scenic Byway offers a scenic drive to the Blanchard Springs Caverns. Forest headquarters are located in Russellville, Arkansas. The Ozark National Forest encompasses  primarily in the scenic Ozark Mountains in northern Arkansas. The forest contains the tallest mountain in Arkansas, Mount Magazine, and Blanchard Springs Caverns. The southern section of the forest lies along the Arkansas River Valley south to the Ouachita Mountains. The forest was created in 1908 by proclamation of President Theodore Roosevelt. The forest is home to over 500 species of trees and woody plants. Hardwoods, predominantly oak and hickory, comprise the majority of the forest. The forest contains five designated wilderness areas and several Wildlife Management Areas. The Ozark Highlands Trail, built and maintained by over 3,000 volunteers, is the longest hiking trail in the forest and extends for from the Buffalo National River to Lake Fort Smith State Park in the far western portion of the state.