For the correct Camp DuBois you can use address 198 N Main St, Wood River, IL 62095 in your mapping application.. then follow Main St which will dead end in the parking lot for the camp.
From St Louis and all points South.. Take I 255 to HWY 143W. Follow 143W through Wood River. Take the first Right after crossing the Railroad tracks. Follow that road to the camp.
From St Charles County and all points North of St Louis… Take I70 to I270N to HWY 3N. Follow HWY3 North to Highway 143.. Turn Right. Take the First Left and follow the road to the camp