The Illinois River creates a wide, hydrologically complex basin here, defining the boundary between Bureau and Putnam counties. This waterway supports an extensive network of backwater features, including Depue Lake, Spring Lake, and Lower Spring Lake, alongside the managed Hormel Ponds. The river's influence is central to the area's geography, with the Old Channel Big Bureau Cr and Bureau Cr converging near the western rail and road hub of Bureau Junction. On the southern bank, the village of Hennepin serves as a civic anchor, centered on the Putnam County Courthouse.
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This is the sole edition of this map. No revisions or reprints were ever made.
1893 · Lacon
USGS Topo · 1:62,500
1893 · Hennepin
USGS Topo · 1:62,500
1893 · Lasalle
USGS Topo · 1:62,500
1909 · Hennepin
USGS Topo · 1:62,500
1911 · La Salle
USGS Topo · 1:62,500
1911 · Hennepin
USGS Topo · 1:62,500
1913 · La Salle
USGS Topo · 1:62,500
1933 · Lacon
USGS Topo · 1:62,500
1934 · Wenona
USGS Topo · 1:48,000
1937 · Lacon
USGS Topo · 1:62,500