The Fox River carves a deep valley through this portion of LaSalle County, serving as the primary geographic axis for settlements like Wedron and Dayton. The river's influence on the landscape is clear, with smaller tributaries such as Indian Creek and Crookedleg Cr cutting through the surrounding agricultural tablelands. To the south, the Illinois and Michigan Canal National Heritage Corridor skirts the edge of Ottawa, marking a corridor of significant importance to the region's transport history.
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1892 · Marseilles
USGS Topo · 1:62,500
1892 · Ottawa
USGS Topo · 1:62,500
1915 · Ottawa
USGS Topo · 1:62,500
1916 · Marseilles
USGS Topo · 1:62,500
1940 · Marseilles
USGS Topo · 1:62,500
1946 · Ottawa
USGS Topo · 1:62,500
1948 · Sandwich
USGS Topo · 1:62,500
1950 · Sandwich
USGS Topo · 1:62,500
1951 · Earlville
USGS Topo · 1:62,500
1958 · Aurora
USGS Topo · 1:250,000