ISAS occupies large central facilities on the edge of the University of Illinois' campus that include administrative offices, computer and GIS facilities, processing and research laboratories, and significant lithic, ceramic, and ethnobotanical comparative collections. The Survey curates major prehistoric and historic archaeological collections from massive transportation archaeology projects and early Cahokia Mounds World Heritage site collections from the excavations of A.R. Kelly, W.K. Moorehead, and C.J. Bareis with the associated photographic, map, and documentary records. ISAS is also one of three repositories for the records of the state’s professional organization, the Illinois Archaeological Survey. Facilities for visiting scholars are available in Champaign and at several of the field stations. The Charles J. Bareis Documents Collection, specializing in CRM-related materials, is kept at the Survey offices while researchers also have access to the main campus libraries of the University of Illinois, Urbana.
The various field stations within ISAS conduct archaeological resource and research projects that provide funding and research opportunities for students and other researchers. ISAS archaeologists hold academic professional appointments within the University. Various regional field stations conduct archaeological research and field investigations across the state. These include the Central Illinois Field Office in Champaign covering east-central Illinois; the American Bottom Field Station – Wood River performs archaeological research in the Greater St. Louis metropolitan area and most of southern Illinois; the Western Illinois Field Stations in Jacksonville and Macomb covers the central and western portions of the state; and the Northern Illinois Field Station performs archaeological investigations in the counties just south of the Wisconsin border between the Mississippi Valley and Lake Michigan. The Survey support staff located in the central offices in Champaign provides administrative and analytical services, physical anthropology, curation, cartography/GIS, photographic and artistic resources, publishing, and computer support for the Survey Field Stations.