(Yankee Harbor, 41', 1975, 13-49-D) across a brook in 6 Flags Great America W. of Gurnee, Wilson Township, Lake County, IL. IL132 (Grand Av.) E. 0.7 miles from jct with I94 exit 69, S. on 6 Flags Dr. 0.3 miles. Bridge is inside the park. Admission. (09-1981, N42 21.991 W87 55.897) Photo by Don Burnell.