Lower Mississippi River - area subject to overbank flooding

<div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'>This map shows the approximate extent of overbank flooding in the Lower Mississippi River prior to extensive construction of levees.  </span></div><div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'> </span></div><font face='Avenir Next W01, Avenir Next W00, Avenir Next, Avenir, Helvetica Neue, sans-serif'><span style='font-size:16px;'>It was digitized from this map: https://fws.maps.arcgis.com/home/item.html?id=6941d5d2a1a84d05b771ef854a192d40 </span></font><div><font face='Avenir Next W01, Avenir Next W00, Avenir Next, Avenir, Helvetica Neue, sans-serif'><span style='font-size:16px;'><br /></span></font></div><div><font face='Avenir Next W01, Avenir Next W00, Avenir Next, Avenir, Helvetica Neue, sans-serif'><span style='font-size:16px;'>The original source map is derived from an online source (https://www.digitalcommonwealth.org/search/commonwealth:7h14b0450).  Map of the alluvial valley of the Mississippi River from the head of St. Francis Basin to the Gulf of Mexico, showing lands subject to overflow, location of levees and trans-alluvial profiles. </span></font><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'>The map shows the landscape configuration and the approximate extent of overbank flooding before extensive construction of the levees in the early 1900s. The map was georectified using ERDAS Imagine and contemporary data sources.  </span><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><div style='font-family:inherit;'><br />Edited (to correct position of panels) and georeferenced by Yvonne Allen (USFWS) to geographic NAD1927 using ArcGIS , 3rd order polynomial and 80 ground control points using lat lon grid.<br /><div style='font-family:inherit;'><br /></div><div style='font-family:inherit;'>Online repo: https://www.sciencebase.gov/catalog/item/58f66491e4b0bd52222f7821</div></div></div></div>