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The 25-Cent Flood Protection Device Why are we still using sandbags to keep rivers from overflowing? By Jacob Leibenluft The Mississippi River breached more than a dozen levees in the St. Louis, Mo., area Thursday as flooding continued to spread across the Midwest. To mitigate the damage, the U.S. Army Corps of Engineers alone has distributed nearly 13 million sandbags, most of which have been filled and laid down by local residents. Why do we still use sandbags? Because they're cheap, easy to use, and usually effective. The familiar image of the burlap sack stuffed with sand goes back at lea