Joliet Arsenal, a decommissioned Army munitions facility in Illinois, is being restored by the USDA Forest Service as Midewin National Tallgrass Prairie. I used a new GIS method to help the Forest Service better utilize complex spatial data for restoration and management. First I defined top restoration priorities for restoration sites: existing prairie and surroundings, good restoration potential, and low infrastructure density. Then I used ARC GRID and ran a classification and regression tree (CART) analysis to spatially quantify each priority into a coverage. Finally I combined the coverages to create one comprehensive restoration prioritization map.