Anytime, ME3. I'm not sure I agree with you about Ricky being familiar with Illinois, though. We don't know how far RM had travelled out of the St. Louis area. Believe it or not, I know more than a few people who had never been farther than 30-40 miles outside of New Orleans until Katrina forced them to evancuate. RM didn't have much money, so I doubt he made many road trips. If he were planning a trip 355 miles away from home, I can see him looking at a map and noting key intersections.
I've also wondered if RM was smitten with a woman who lived in northern Illinois, or even Canada. A lady named WLD.

He probably didn't have the means to actually make the trip, but he enjoyed daydreaming about it, planning for "one day". LE probably would've figured that out though, and realized his notes were insignificant.
Anyway, I didn't make it as far as Hwy 651 on my own little road trip last night.

I'm going to dig around there later. I'm curious to see what you mean by "cut centers" of the lake. BTW, Canadian highways are measured in kilometers.