The lock and dam system was completed on the Mississippi River in the 1930s to improve navigation and flood control.

In the 1930s, the U.S. completed the lock and dam system along the Mississippi River, a major engineering project that greatly enhanced river navigation. The system was designed to control water levels, prevent flooding, and allow for more efficient transport of goods along the river. The lock and dam system remains crucial for maintaining waterway traffic, supporting the economy, and protecting communities along the Mississippi River.