The Mainline Mississippi River Levee was originally built in the 1800s. Following the flood of 1927, Congress passed the Flood Control Act of 1928, creating the Mississippi River & Tributaries (MR&T) Project. The notches at Main and Central Streets were the top of the levee in 1927. The levee was then raised 10 feet and cut-offs were built that shortened the river by 170 miles. The banks were stabilized to keep the river in one location. The MR&T Project was successful in containing the record 2011 Flood.