2021 Map of Illco

About this map

Natrona County's high plains drainage systems are clearly defined in this modern survey, which focuses on the intricate networks of seasonal draws and creeks that shape the Wyoming landscape. Thirtythree Mile Rd cuts across the southwestern corner of the quadrangle, providing the primary corridor through this open terrain. The hydrological pattern is dominated by the Casper Cr system, including the Middle Fork Casper Cr and N Fork Casper Cr, which converge as they move toward the south. To the north, the landscape is etched by the Twentymile Draw and its North Fork Twentymile Draw, alongside Smith Draw. These features represent the essential water-security landmarks for local land use and ranching history in a region defined by its wide, undeveloped stretches and subtle elevation changes.