Horse Heaven Hills define the northern landscape of this region, where deep drainage systems carve through the plateau toward the Columbia River basin. The terrain is characterized by a series of prominent ravines, including Taylor Canyon, Coyote Canyon, and Amon Canyon, which illustrate the complex topography south of the Tri-Cities area. While modern roads like Plymouth Rd and Coyote Canyon Rd provide access through the hills, the map preserves the names of earlier land divisions and family-named routes such as H Smith Rd and Bently Rd. The area between Badger Canyon and Fourmile Canyon shows a transition from high ridges to the gentler slopes of the lower canyon floors, revealing the historical importance of water drainage and natural corridors in determining the local road network.
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This is the sole edition of this map. No revisions or reprints were ever made.
1908 · Umatilla
USGS Topo · 1:125,000
1917 · Pasco
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
1962 · Irrigon
USGS Topo · 1:24,000
1962 · Umatilla
USGS Topo · 1:24,000
1964 · Johnson Butte
USGS Topo · 1:24,000