
The Umatilla National Forest defines this high-elevation landscape where the boundaries of Morrow Co and Grant Co meet. The terrain is characterized by a complex system of deep drainage basins, most notably where the North Fork John Day River and the Middle Fork John Day River converge into the main branch of the John Day River. This confluence represents a critical hydrological junction in the region, surrounded by prominent peaks such as Slickear Mtn and Murphy Mtn. The map reveals a remote environment shaped by seasonal watercourses like Potamus Creek and Elder Creek, which carve out numerous named passages including Slickear Canyon and Wrightman Canyon. Navigational waypoints such as Fourmile Gap and Twomile Gap indicate the historical routes through the rugged divide between the various river forks.
31 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 · Ritter
USGS Topo · 1:62,500
1951 · Monument
USGS Topo · 1:62,500
1952 · Ritter
USGS Topo · 1:62,500
1953 · Pendleton
USGS Topo · 1:250,000
1955 · Canyon City
USGS Topo · 1:250,000
1956 · Pendleton
USGS Topo · 1:250,000
1959 · Canyon City
USGS Topo · 1:250,000
1969 · Lake Penland
USGS Topo · 1:24,000
1969 · Thompson Flat
USGS Topo · 1:24,000
1969 · Madison Butte
USGS Topo · 1:24,000