(Preserve Rock Run, 38' x 23', 2001, 13-99-B) across Rock Run Creek in Joliet, Will County, IL. US52 E. 1.5 miles from jct with I55 on the SW corner of Joliet, N. on Essington Rd. 2.0 miles, E. on Theodore St. 0.3 miles to the bridge on the S. side of the road. (7-7-02, N41° 33.019', W88° 09.324')