Marcum, P; Ellis, J; Zylka, J; Carroll-Cunningham; Ebinger, JE
United States, Illinois, Will, Grant Creek Nature Preserve, On Department of Natural Resources property, along the east side of Interstate 55, Exit 241 near Wilmington, go to the east frontage road of Interstate 55, then turn north and go 0.8 mile. Grand Prairie Section of the Grand Prairie Natural Division. Quadrangle: Wilmington Kankakee River Watershed.