1982 Map of Irish Creek SW

About this map

Cheyenne River Indian Reservation lands dominate this prairie landscape in Ziebach County, where a network of seasonal watercourses defines the topography. The drainage system is characterized by the confluence of East Beaver Trap Creek and West Beaver Trap Creek, which merge into the main stem of Beaver Trap Creek as it winds southward. These creek beds and the nearby Sophia Creek provided critical water sources in a region where settlement was sparse and largely dictated by the availability of surface water. A notable human landmark in this section of the plains is the Dorsey Landing Strip, positioned near the western edge of the survey area. Farther east, Irish Creek meanders through the breaks, illustrating the classic erosional patterns of the South Dakota backcountry in the early 1980s.