
The Old Indian Treaty Boundary and its namesake Treaty Boundary Road cut a historical line across this portion of northern Illinois in the early 1980s. The landscape is defined by an extensive network of drainage infrastructure, including the Big Slough Ditch, Wildcat Ditch, and Central Special Ditch, which transformed the low-lying terrain into productive farmland. Small communities and rural junctions such as Hooppole, Leon Corners, and Aliceville serve as the primary hubs for the surrounding townships.
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This is the sole edition of this map. No revisions or reprints were ever made.
1899 · Clinton
USGS Topo · 1:125,000
1929 · Annawan
USGS Topo · 1:62,500
1932 · Prophetstown
USGS Topo · 1:48,000
1932 · Annawan
USGS Topo · 1:62,500
1934 · Geneseo
USGS Topo · 1:62,500
1936 · Prophetstown
USGS Topo · 1:62,500
1952 · Erie
USGS Topo · 1:62,500
1953 · Atkinson
USGS Topo · 1:24,000
1958 · Davenport
USGS Topo · 1:250,000
1958 · Aurora
USGS Topo · 1:250,000