![]() ![]() Courts ruled the corps had the right to do it, but also said the corps should cooperate with the states. Also, Minnesota and Wisconsin sued the corps over how it handled the sand, contending it was ruining habitat. The federal Clean Water Act of 1972 helped force the corps to look at better ways to dredge, he said. With so many things complicating the issue, dredging "becomes more and more difficult," Tapp said. When it found ways to help the environment, it ran into problems with not being allowed to do some because they might worsen flooding. ![]() Today, the corps must also take into account the impact of dredging, and dredged material, on the environment. That, however, destroyed fish and wildlife habitat. ![]() Dredges simply blew or dumped the sand onto the nearest convenient piece of land and moved on. Paul District's Channels & Harbors Project Office.įor the first few decades after dams were closed, the corps didn't need a plan. It is beginning a second series of 40-year plans for the dredged material the one for Pool 6, which is around Winona, will be done this summer and those for further up the Mississippi should be done later this year or early next year, Steve Tapp, operations manager for the St. ![]() Corps of Engineers is trying to find new places or uses for the sand. Thus began the need for dredging, a need that is growing in complexity and volume. That, in turn, created a place for powerful towboats to safely push large barges up and down the river.īut as soon as the dams were closed, sediment from larger rivers, such as the Minnesota, and scores of smaller ones such as the Zumbro, Whitewater and Root, began building up, creating the threat that some parts would become too shallow for the barges. In the mid 1930s, the final lock and dam was completed in this region of the Mississippi River, making the main channel at least 9 feet deep. ![]()
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