2017 Map of Illco

About this map

Illco marks the southwestern corner of this landscape in central Natrona County, where the high plains are defined by an intricate network of intermittent drainage systems. The terrain is shaped by the southward flow of Smith Draw and the extensive Twentymile Draw, which is joined by the North Fork Twentymile Draw as it cuts through the open range. Modern infrastructure is sparse, represented primarily by Thirtythree Mile Rd as it skirts the lower reaches of the map near the confluence of N Fork Casper Cr and Casper Cr. This survey illustrates a characteristic Wyoming rangeland environment, where the land is partitioned into township and range blocks and development is limited to the essential corridors connecting this remote territory to the broader region.