I could get into more about Pontoon, but it would all be opinion and unqualified at best. I was never blessed to live in Granite City's suburb, so I'll try to keep to what I know and even then, I don't do a good job...
Had it all been Granite City in the 1960's instead of forming their own village, there would have been quite a formidable municipality occupying the southwest corner of Madison County, more poised for growth opportunities to this day.
I could explain why if I had to -- but kind of screen tired right now. : )