
Mermet Lake and its surrounding wetlands anchor the southwestern corner of this landscape, where the boundary between Johnson Co and Massac Co divides a region defined by complex drainage networks. The southern lowlands are heavily managed by a system of man-made waterways, including the New Columbia Ditch, Bear Creek Ditch, and Main Ditch, which redirect water through former marshlands toward the Ohio River basin. In contrast, the northern terrain rises toward distinctive elevations like Blue Knob and Cagle Bluff.
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1917 · Brownfield
USGS Topo · 1:62,500
1918 · Vienna
USGS Topo · 1:62,500
1919 · Vienna
USGS Topo · 1:62,500
1926 · Paducah
USGS Topo · 1:62,500
1928 · La Center
USGS Topo · 1:62,500
1929 · Paducah
USGS Topo · 1:62,500
1932 · La Center
USGS Topo · 1:62,500
1940 · Paducah
USGS Topo · 1:62,500
1942 · Vienna
USGS Topo · 1:62,500
1949 · Paducah
USGS Topo · 1:250,000