
Thirtymile Cr and its tributaries, including Salmon Fork Thirtymile Cr, carve a complex drainage system through this portion of Wheeler and Gilliam Counties. The landscape is defined by its deep canyons and prominent geologic features like Steamboat Rock and the high vantage point of Rettie Butte. A portion of the Umatilla National Forest occupies the southeastern corner, while the Kinzua Airport sits near the southern boundary, reflecting the area's mix of natural preservation and aviation infrastructure.
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This is the sole edition of this map. No revisions or reprints were ever made.
1916 · Condon
USGS Topo · 1:125,000
1926 · Mitchell
USGS Topo · 1:125,000
1953 · Spray
USGS Topo · 1:62,500
1953 · Pendleton
USGS Topo · 1:250,000
1953 · The Dalles
USGS Topo · 1:250,000
1955 · Bend
USGS Topo · 1:250,000
1955 · Canyon City
USGS Topo · 1:250,000
1956 · The Dalles
USGS Topo · 1:250,000
1956 · Pendleton
USGS Topo · 1:250,000
1957 · Bend
USGS Topo · 1:250,000