
The Illinois River valley near Manito and Forest City is defined by a complex network of backwater lakes and artificial drainage systems. At mid-century, the landscape is divided between the sprawling wetlands of Spring Lake, Clear Lake, and Rice Lake and the intensely managed agricultural flats to the east. The proliferation of ditches, such as Quiver Ditch and Main Ditch, indicates a massive coordinated effort to reclaim the fertile bottomlands of Mason County.
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