Welcome to the Secondary Base Series (SBS) map page. The complete SBS collection, consists of approximately 350 map sheets that cover all or part of the National Forests and Grasslands. SBS maps for the coterminous United States are produced at a scale of 1:126,720 and are used to produce Forest Visitor Maps (FVM). The FVMs serve as a public recreation map for Forest Service and National Grasslands and other customized purposes.
This site is the beginning of a Forest Service effort to make SBS and FVM maps available and will continue to grow and evolve. Only a few of the potential 350 maps are currently now on line.