More map facts.
I based it vaguely on the area of US-26 running between Oshkosh and Broadwater. Although the angle of the river is a bit off but that should only bug me. (Or, I could just put an arrow pointing 15 degrees west of north on the map and call it perfect.

) Oshkosh would be where I have the I-380 beltway branch off from I-80. And Broadwater would be a town west of the The Smokes which I-29 passes just west of.
This placement also means the Unobtainium mines are located in what on our Earth is the Crescent Lake National Wildlife Preserve. Again, since it was founded in 1848, presumable, the wildlife in the area was obliterated by the mining companies long before the National Parks Commission could attempt to preserve them.
It is easily argued I should have placed the city closer to Scott's Bluff since that area of the state in our world had little train service until the late 1890s.
The City of the Future, Today description of Centropolis is at odds with this map in one important way and one minor one. The minor one is the mention of Sunny Newark in the Blue Bluffs entry. I suspect that is a reference to a name changed Sunnyvale. The bigger one is harder to deal with. It says Sunnyvale is north of the Crescent Lake Preserve. Problem is, the preserve is north of the north most spur of the Northern Platte River and there are no rivers in Nebraska that would work. So perhaps there is another Crescent Lake south of Sunnyvale and a National Preserve developed there instead of the place where it is on our Earth.
Finally, I didn't add it, because I didn't want to name it, but there should probably be a sizable International airport in the city, being even bigger, better, and higher tech than Denver's airport 170 miles to the southwest. Probably located south east of the river since there's nothing out there at the moment. So some of that suburban sprawl could include the splash of hotels and bars that surround an airport.