United States, Illinois, Union, 0.3-0.4 mile south of IL 3 and IL 146 junction along IL 3. West side of road in transition area between roadside and flood plain forest. Ware 7.5 minute Quadrangle.
37.4426 -89.3951
T. 12S, R. 3W, SE1/4 NW1/4 SW1/4 Sect. 25
Site 1B of Hill & Koontz 2002 technical report for IDOT project FAP 312 (IL 3)