
The Minnesota River carves a deep valley through this agricultural landscape, acting as a primary corridor for both rail and road transit in the mid-1980s. Major regional centers like New Ulm and Mankato anchor the river's path, while the surrounding plains are defined by an extensive drainage network, including Judicial Ditch No 1 and numerous other numbered channels that supported local farming. The Chicago and North Western railroad provides the backbone for smaller prairie settlements such as Sleepy Eye, Springfield, and Madelia.
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1950 · Mankato East
USGS Topo · 1:62,500
1951 · Mankato East
USGS Topo · 1:62,500
1951 · Mankato West
USGS Topo · 1:62,500
1952 · Morton
USGS Topo · 1:62,500
1952 · Redwood Falls
USGS Topo · 1:62,500
1953 · Morgan
USGS Topo · 1:62,500
1953 · Saint Paul
USGS Topo · 1:250,000
1953 · New Ulm
USGS Topo · 1:250,000
1954 · Fairmont
USGS Topo · 1:250,000
1954 · Mason City
USGS Topo · 1:250,000