The Rock River serves as the central artery for this borderland corridor, where the Illinois and Wisconsin state line bisects the contiguous communities of Beloit and South Beloit. The river’s course southward connects several distinct residential and industrial zones, including Morehaven, Riverdale, and Roscoe. Near the western edge, the Pecatonica River joins the Rock River at the village of Rockton, a confluence marked by complex wetlands and drainage patterns including Raccoon Cr.
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1891 · Janesville
USGS Topo · 1:62,500
1893 · Janesville
USGS Topo · 1:62,500
1893 · Shopiere
USGS Topo · 1:62,500
1918 · Rockford
USGS Topo · 1:62,500
1918 · Belvidere
USGS Topo · 1:62,500
1938 · Rockford
USGS Topo · 1:62,500
1944 · Belvidere
USGS Topo · 1:62,500
1949 · Rockford
USGS Topo · 1:24,000
1954 · Rockford
USGS Topo · 1:250,000
1955 · Rockford
USGS Topo · 1:250,000