There is a steep drop here away from the mississippi s main channel into the atchafalaya basin. One in the twin.
Even earlier prehistoric channels underlie the more recent patterns.
Mississippi river channel map. Here is a map of the mississippi river that illustrates that fact. The mississippi river gulf outlet canal abbreviated as mrgo or mr go is a 76 mi 122 km channel constructed by the united states army corps of engineers at the direction of congress in the mid 20th century that provided a shorter route between the gulf of mexico and new orleans inner harbor industrial canal via the intracoastal waterway in 2005 the mrgo channeled hurricane katrina s. The modern river course is superimposed on channels from 1880 green 1820 red and 1765 blue.
Mississippi river the longest river of north america draining with its major tributaries an area of approximately 1 2 million square miles or about one eighth of the entire continent. And since the river is so long stretching from minnesota to the gulf of mexico here are two maps. There were already three locks and dams.
Those that correspond to historical records are dated while older channels are ordered according to the principle of superposition newer. The old river control structure between the present mississippi river channel and the atchafalaya basin sits at the normal water elevation and is ordinarily used to divert 30 of the mississippi s flow to the atchafalaya river. Two rivers two maps much like the river itself the corps mapping efforts can be divided into two eras.
Upper mississippi river naviga tion charts are a useful item to have onboard. States and two provinces in canada. One map will show the upper mississippi river and the other the lower mississippi river.
Construction of the lock and dam system began in the early 1930s. With its tributaries the mississippi river drains all or part of 31 u s. This map of an area just north of the atchafalaya river shows a slice of the complex history of the mississippi.
Historic flooding along the mississippi river gives me an excuse to show another of my favorite maps from geological investigation of the alluvial valley of the lower mississippi river. Map of mississippi river showing how it splits country in half. Map pages are geospatially enabled to allow for interactive use on certain devices.
Each color represents an old channel dating back 1 000 years or so. Pre lock dam and post lock dam. Download individual pages from the 2011 upper mississippi river navigation charts book as pdf files.