The Illinois River dictates the landscape of this region, separating the industrial and residential centers of Pekin and Bartonville from the westward rural townships. The river's broad floodplain is dominated by significant water bodies and engineering, notably the expansive Powerton Cooling Lake situated just south of Powerton. This industrial footprint is balanced by a dense cluster of burial grounds and community centers, including Sacred Heart Catholic Cem and Veteran's Memorial Cem near the city center, and the more secluded Bequaith Cem to the southwest. The terrain transitions from the river bottomlands up into the bluffs where settlements like Mapleton and Hollis are situated. Numerous tributaries such as Lamarsh Cr and its branches, E Br Lamarsh Cr and W Br Lamarsh Cr, carve through the western hills, defining the early drainage patterns and roadway layouts that persist in this modern survey.
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1905 · Peoria
USGS Topo · 1:62,500
1927 · Peoria
USGS Topo · 1:62,500
1929 · Manito
USGS Topo · 1:62,500
1930 · Glasford
USGS Topo · 1:62,500
1932 · Manito
USGS Topo · 1:62,500
1942 · Delavan
USGS Topo · 1:62,500
1948 · Glasford
USGS Topo · 1:62,500
1949 · Peoria East
USGS Topo · 1:24,000
1949 · Peoria West
USGS Topo · 1:24,000
1950 · Peoria West
USGS Topo · 1:24,000