Koshkonong serves as the central hub of this Missouri landscape, situated where local county roads and rail access meet in southern Oregon County. The area is defined by a complex network of drainage systems, including Bussell Branch and Clifton Branch, which carve through the Ozark plateau. A striking geological concentration is found at Grand Gulf, home to the Grand Gulf Natural Bridge, a significant karst feature that illustrates the unique subterranean drainage of this region.
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1938 · West Plains
USGS Topo · 1:24,000
1940 · West Plains
USGS Topo · 1:24,000
1943 · Thayer
USGS Topo · 1:62,500
1944 · West Plains
USGS Topo · 1:62,500
1946 · Thayer
USGS Topo · 1:62,500
1946 · West Plains
USGS Topo · 1:62,500
1950 · Salem
USGS Topo · 1:62,500
1951 · Salem
USGS Topo · 1:62,500
1957 · Poplar Bluff
USGS Topo · 1:250,000
1959 · Poplar Bluff
USGS Topo · 1:250,000