The Columbia River carves a deep path through this borderland between Okanogan and Douglas counties, creating a landscape defined by sharp elevation changes and numerous natural springs. High above the river, features like Jackass Butte, Castle Rock, and Tombstone Rocks mark the high desert terrain. The river itself is punctuated by Granite Rapids and Patson Rapids, indicating the powerful flow of the waterway through this stretch. Evidence of local ranching or survey history is found in names like Saddle Horse Flat and School Section Spring. The southern portion of the map is dominated by the namesake Trefry Canyon and Henderson Canyon, while the presence of Tag Ear Lake and Elbow Lake provide rare standing water in the higher elevations. This map shows a network of remote roads including Columbia River Rd and Timm Rd, which connect the scattered springs and landmarks across the arid breaks.
58 named features on this map. Tap any name to fly to it.
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This is the sole edition of this map. No revisions or reprints were ever made.
1950 · Boot Mtn
USGS Topo · 1:62,500
1950 · Alameda Flat
USGS Topo · 1:62,500
1952 · Alameda Flat
USGS Topo · 1:62,500
1953 · Ritzville
USGS Topo · 1:250,000
1954 · Okanogan
USGS Topo · 1:250,000
1958 · Okanogan
USGS Topo · 1:250,000
1959 · Ritzville
USGS Topo · 1:250,000
1965 · Ritzville
USGS Topo · 1:250,000
1968 · Barker Canyon
USGS Topo · 1:24,000
1968 · Foster Coulee
USGS Topo · 1:24,000