In 1958, the United States Army Corps of Engineers completed Coralville Dam along the Iowa River, four miles (6 km) north of the city, creating Coralville Lake. Except for the Great Flood of 1993 and the Great Iowa flood of 2008, the dam has helped prevent serious flooding in the city. From June through August 1993, all three of Coralville's main transportation links with Iowa City were submerged. The economic impact that year was severe, but the city had almost fully recovered within two years. The 2008 flood proved to be more costly as the Iowa River surpassed the 1993 record crest at over .