
The Horse Heaven Hills dominate this portion of south-central Washington, where the landscape is defined by a series of deep drainage systems cutting through the high basalt plateau. The Yakima and Klickitat county line bisects the territory, following the path of Co Line Rd across the southern half. This sparsely populated agricultural and rangeland region is anchored by the Glade Cem located near Glade Creek, reflecting the early settlement patterns of the local ranching community.
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1906 · Blalock Island
USGS Topo · 1:125,000
1908 · Blalock Island
USGS Topo · 1:125,000
1910 · Zillah
USGS Topo · 1:125,000
1915 · Prosser
USGS Topo · 1:125,000
1916 · Arlington
USGS Topo · 1:125,000
1917 · Prosser
USGS Topo · 1:125,000
1950 · Yakima
USGS Topo · 1:250,000
1953 · Pendleton
USGS Topo · 1:250,000
1953 · Walla Walla
USGS Topo · 1:250,000
1953 · The Dalles
USGS Topo · 1:250,000