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1970 Map of Seneca

Name: 1970 Topographic Map of Seneca
Creator: U.S. Geological Survey
Published: 1972
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1972

About this map

The Illinois River corridor near Seneca is defined by a dense intersection of historical industrial and transport infrastructure during the 1970s. The landscape reflects the transition from early commerce to modern industry, with the Illinois and Michigan Canal (Abandoned) running parallel to the active Chicago Rock Island and Pacific railroad lines. Significant river features like Grist Island, Barry Island, and McNellis Bayou punctuate the waterway, while the local economy is anchored by a large Chemical Plant and several Gravel Pits.

To the south, the terrain shifts into the rural townships of Norman and Brookfield, where the small settlement of Langham sits along an Old RR Grade. The presence of a U.S. Govt Reservation and a Landing Strip suggests the strategic and utilitarian role this portion of the valley played in the mid-20th century. Prominent elevations like Holderman Hill provide a contrast to the bottomlands of North Kickapoo Creek and Hog Run.