2017 Map of Yesmowit Canyon

About this map

Yesmowit Canyon and the surrounding drainages of Yakima County define this high-elevation landscape within the Yakama Indian Reservation. This modern survey illustrates a network of Bureau of Indian Affairs roads, such as Bia RD 4 and Bia RD 147, which provide access to remote ridges including Sedge Ridge and Ahtanum Ridge. The area is characterized by a series of parallel canyons and ridges, where seasonal water sources like Soda Springs and streams such as S Fork Simcoe Cr and Wahtum Cr flow through the deep-cut topography. The map reveals the intricate natural drainage patterns that have shaped the region, from the northern S Fork Ahtanum Cr down to the distinctive namesake Yesmowit Canyon in the south. This detailed topographic study serves as an essential record of the physical geography and administrative road system in this part of Washington state.