From the intersection of Interstates 55 & 80 (since Chicago is such a large area):

Take I-55 South to I-74 West (Exit 163 toward Peoria)

On I-74W go 26.5 miles to I-155 South (Exit 101 toward Lincoln)

On I-155S go 10 miles to Townline Road (Exit 22)

At top of ramp turn right, after 3.5 miles Townline Road jogs right then an almost immediately left

Continue 13 miles on Townline Road to County Road 750 E/N (aka Manito Road), turn left onto Manito Road

Travel 1 mile south on Manito Road to County Road 1100 N (Spring Lake Road) and turn right

Follow Spring Lake Road 4.5 miles to Spring Lake North Boat Ramp on right.