1969 Map of Onawa

About this map

The Missouri River floodplain defines this 1969 survey of Monona County, where an intricate network of drainage canals like Monona Harrison Ditch and Garretson Ditch manages the low-lying terrain. The city of Onawa serves as the central hub, detailed with its grid system, the Courthouse, and the West Monona Sch. The map records the intersection of regional infrastructure and local life, from the Chicago and North Western railroad tracks to the Onawa Municipal Airport and the Fairground on the northern edge of town. To the northeast, the small settlement of Kennebec sits near the winding path of the Little Sioux River. This era shows the landscape fully adapted for agriculture, with the extensive ditch system—including the Pratt Ditch and Hackett Ditch—supporting the farms across the townships of Ashton and Belvidere.