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2018 Map of Long Island

Name: 2018 Topographic Map of Long Island
Creator: U.S. Geological Survey
Published: 2018
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2018

About this map

La Grange, Missouri, sits at the western edge of this 2018 survey, where the Mississippi River forms a complex network of islands and side channels. The river’s shifting geography is defined by significant landmasses like the sprawling Long Island, which is separated from the Illinois shore by the Canton Chute. This riverine landscape is deeply shaped by drainage and navigation infrastructure, evidenced by the Main Ditch cutting through the lowlands north of Indian Grave Lake. On the eastern bluffs in Illinois, the settlement of Ursa marks the transition from the floodplains to higher agricultural ground.

Local researchers can trace the intricate waterways and sloughs that define this border region, including Carner Slough and Long Island Lake. The map also captures several smaller river islands such as Flannigan Island, Libby Island, and Shandrew Island, alongside the riverside Blickhan Landing Area. This detailed look at the river corridor highlights the persistent relationship between the towns of Lewis and Adams counties and the seasonal variations of the river’s reach.