Troy Grove sits at the heart of this agricultural landscape in northern LaSalle County, where the village's grid of streets like Main St and Union St meets the winding course of the Little Vermilion River. The area's hydrology is complex, defined by the confluence of numerous waterways including Vermilion Cr, Tomahawk Cr, and Pecumsaugan Cr. These streams carve through the prairie, creating distinctive landforms such as Tomahawk Bluff just south of the main settlement.
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1892 · Ottawa
USGS Topo · 1:62,500
1893 · Lasalle
USGS Topo · 1:62,500
1911 · La Salle
USGS Topo · 1:62,500
1913 · La Salle
USGS Topo · 1:62,500
1915 · Ottawa
USGS Topo · 1:62,500
1946 · Ottawa
USGS Topo · 1:62,500
1947 · La Salle
USGS Topo · 1:62,500
1951 · Earlville
USGS Topo · 1:62,500
1952 · Mendota
USGS Topo · 1:62,500
1958 · Aurora
USGS Topo · 1:250,000