All flood threat is not over in Vicksburg, Mississippi; but the Mississippi River has crested, engineers believe, at 14.1 ft above flood stage level. Moving at 13 mph (normal rate, 5 mph) and carrying 17 million gallons of water per second, the potential flood damage could have been enormous. Round-the-clock maintenance and monitoring of levee defenses seems likely, though, as high water levels may linger until mid-June.