1968 Map of Illco

About this map

The Chicago and Northwestern railroad corridor anchors the southern edge of this landscape, passing through the small settlement of Illco. This late 1960s survey reveals a region defined by the intricate drainage systems of the Casper Creek watershed, including the North Fork and Middle Fork Casper Creek. The terrain is characterized by long, winding draws such as Smith Draw and the North Fork Twentymile Draw, which dictate the local topography and historical movement through this part of Natrona County. Transportation is focused along the Thirtythree Mile Road, which parallels the rail line. The presence of a Spring and named points like Piney suggests the importance of water sources and landmarks in this relatively sparse environment during the era of field checking in 1968.