1927 USGS 1:62,500 topographic map with shaded relief in 20″ x 24″ layout.
This is part of a series of maps show the major tributaries of the Mississippi River. This map depicts of the confluence of the Illinois River, and it also shows the Missouri river just upstream of the confluence. I never realized how closely these two major rivers enter the Mississippi.
The floodplain elevation is show with relative elevation models overlain on the rendered elevation. The relative elevation models use different color ramps and slightly different ranges.
You can download the map without the color ramp over the map image using the link below.