
The Horse Heaven Hills define the physiography of this Benton County landscape, where the high ridges are incised by deep drainage systems like Nine Canyon and Fourmile Canyon. The terrain reflects a carefully managed agricultural environment, evidenced by the presence of the Division Four Canal cutting across the northern reaches near a prominent high point known as The Butte. Unlike more densely populated regions, the human footprint here is primarily expressed through a network of rural access routes such as Nine Canyon Rd and S Finley Rd that navigate the varied elevations of the Switzler Canyon area.
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1908 · Umatilla
USGS Topo · 1:125,000
1915 · Wallulah
USGS Topo · 1:96,000
1917 · Pasco
USGS Topo · 1:125,000
1918 · Wallula
USGS Topo · 1:125,000
1935 · Pendleton
USGS Topo · 1:125,000
1953 · Pendleton
USGS Topo · 1:250,000
1953 · Walla Walla
USGS Topo · 1:250,000
1956 · Pendleton
USGS Topo · 1:250,000
1958 · Walla Walla
USGS Topo · 1:250,000
1962 · Hat Rock
USGS Topo · 1:24,000