
The Sangamon River forms a winding southern boundary for this portion of Mason County, where a complex network of agricultural drainage systems now defines the landscape. Early 21st-century topography shows how the natural hydrology of Perry Slough and Wash Lake Slough has been integrated into managed waterways like the Herget Drainage Ditch and Newton Ditch. Small rural centers such as Poplar City and Biggs persist along the section lines, connected by a rigid grid of county roads.
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