
The Illinois River valley serves as the central artery for this 1958 survey, anchoring major industrial and population centers from Peoria to Pekin. The map documents a mature mid-century landscape where heavy rail lines like the Chicago and North Western and Illinois Central Gulf intersect with a burgeoning highway system, connecting agricultural hubs like Bloomington and Champaign. The presence of Chanute AFB near Rantoul highlights the era's military infrastructure, while protected lands like Mason State Forest and Chautauqua NWR along the river bottomlands offer a stark contrast to the surrounding grid of the Illinois prairie. The map captures the intricate drainage network of the Spoon River and Mackinaw River, essential to the region's productive farmland and early settlement patterns.
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