Chicago Sanitary and Ship Canal opens (1900)
Engineers reversed the Chicago River and opened the Sanitary and Ship Canal to carry sewage away from Lake Michigan. The canal cut an artificial link between the Mississippi and Great Lakes basins that nature never made.
The reversal solved Chicago's drinking-water contamination problem and boosted shipping.
It created a permanent aquatic highway between two basins, the exact path invasive carp now use to approach Lake Michigan.
The Brandon Road barrier exists to plug the hole this canal opened more than a century ago.
