Geologists, hydrologists, engineers, geographers, cartographers and historians will be fascinated by this study of the history and oft-changing courses of the mighty Mississippi River. Four thousand years ago the river took a new course, and ever since it has been looping, meandering and avulsing with great affect upon the settlers enjoying the benefits of travel and rich sediment. If nothing else this account will show you that trade is the greatest unstoppable force on Earth.
Maps and charts are plentiful, helping me understand how the river joined the Red River, abandoned it and rejoined; the composition of soil and sediment made a difference as to where the river could easily break the banks and levees. Portage was made across the neck between meanders to shorten the paddle, in one case, Portage of the Cross, shortening a distance of thirty-seven miles counting three bends and two rivers to six miles across swampy neck. Then engineers decided to break the land barriers in a few meanders, straightening and speeding the course for larger boats. This compelled the building of flood protection banks and walls, so the continued changes of history could no longer be allowed.
The delta has changed too, with distributary rivers like the Atchafalaya taking some of the water and the rest rushing into the sea and dumping its sediment, bringing lobes of land ever further. We're told that in recent years the Mississippi above New Orleans has threatened to rush through damaged levees to flow around the city instead of through it, which would see the city silt up and sit in a salty swamp.
We also learn about the succession and sharing of waves of settlers, from Native tribes to explorers and immigrants. I enjoyed seeing dugout canoes called the pickup trucks of their day. Both floating and sunk dead trees, called snags, and large tangles of them called rafts, had to be removed before bigger ships could ply the river trade. A fantastic steam-powered paddlewheel snag boat, Heliopolis, designed by Henry Shreve, was floating battering ram, saw mill and tug. Shreve also deforested the river banks. Some meander necks were breached using slave or convict labour; in 1831 Shreve used blasting powder. I was fascinated by the jumble and tumble of cause and effects from this work. Much of what the people learned about hydrology they seem to have learned by taking an action and watching what the three dynamic rivers, plus staid-seeming Old River or former channel, and oxbow lakes, did next.
The 1927 flood, when much of the Mississippi waters burst levees and joined the Atchafalaya, devastating the downriver towns, ended any thought that levees alone could suffice as flood control. I had not previously seen the tale of Mrs E.F. Oubre and her son who saved New Texas from disaster by maintaining a cracking levee with sheets, blankets and sacks of earth for sixteen hours in the rain. Another personage of note was Hans Albert Einstein, son of the physicist, who studied hydrology in Switzerland and came to lend his expertise to the river engineers in 1951.
Finally, we examine the 1972 flood risk in detail and look at the existing situation; what is located where, from towns to refineries, and how long it might be before the Atchafalaya takes on the main watercourse. Now we're talking about structures with seven forty-foot high towers; with auxiliaries, spillways and reinforcements; not to mention the world's largest prefabricated power plant. And all in an area with three uplift zones and seismic activity. No wonder the author refers to this river and sediments as a hydrological arms race. Hurricane Katrina and climate change arrived to demonstrate the ultimately the river is probably, as the title suggests, beyond control, with just a sidewise glance at these new threats.
Notes P205 - 247. Bibliography P248 - 279. I counted 42 names that I could be sure were female, including Katrina.
While my e-ARC had no photos I appreciated the many simple charts and drawings, which helped me to appreciate the scale and evolution of the rivers and their couses. I would have liked some aerial and local photos too.
I downloaded a copy from Net Galley. This is an unbiased review. I recommend this well-researched book as excellent reading for students of these fields, provided they are familiar with the terms such as confluence, scouring, avulsion, carrying capacity, as I did not see a glossary.