1966 Map of Fillmore

About this map

The North Fork Maquoketa River carves a deep, winding path through the southern half of this landscape, defining the topography near Cascade. The convergence of multiple waterways, including Whitewater Creek, Canyon Creek, and Johns Creek, creates a highly dissected terrain where early agriculture and transport routes had to navigate significant elevation changes. This mid-1960s survey, with later 1970s updates, captures the intersection of three counties—Dubuque, Jones, and Jackson—illustrating how political boundaries follow the section lines across this drainage basin.