Lake Michigan dominates this 2019 survey, representing the vast majority of the quadrangle's surface area. The map focuses almost entirely on the offshore waters north of the Indiana shoreline, providing a precise contemporary record of the lake's hydrography as documented by the U.S. Geological Survey. Along the very bottom edge of the sheet, the coastal transition is marked by the township boundaries of t37n r8w. This specific focus makes the map a specialized tool for maritime researchers and those studying the shoreline interface near Gary, Indiana, during the late 2010s.
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This is the sole edition of this map. No revisions or reprints were ever made.
1900 · Toleston
USGS Topo · 1:62,500
1934 · Porter
USGS Topo · 1:48,000
1940 · Porter
USGS Topo · 1:62,500
1953 · Gary
USGS Topo · 1:24,000
1953 · Whiting
USGS Topo · 1:24,000
1953 · Garyton
USGS Topo · 1:24,000
1953 · Ogden Dunes
USGS Topo · 1:24,000
1953 · Highland
USGS Topo · 1:24,000
1953 · Chicago
USGS Topo · 1:250,000
1957 · Chicago
USGS Topo · 1:250,000