The ROD recommended a float-in-place lock construction plan, hydraulic dredging, and disposing of dredged material unsuitable for open water discharge in a confined disposal facility, and for material determined to be suitable for freshwater disposal, in the Mississippi River. In 2009, the Corps completed a final SEIS and a Record of Decision (ROD) in response to the 2006 injunction. The Court also criticized the EIS for failing to 'adequately address the risks of flooding and hurricanes in general', and stated further analysis was required of 'the reasonable dredging and disposal alternatives that the Corps had recently adopted for maintenance dredging of the same waters,' post-Katrina. The Court based the injunction upon its finding that the 1997 EIS 'failed to take a 'hard look' at the environmental impacts and consequences of dredging and disposing of the canal's contaminated sediment' as required by the NEPA. In 2006, the United States District Court, Eastern District of Louisiana enjoined the Corps from continuing with the project until the Corps prepared a supplemental Environmental Impact Statement (SEIS) further evaluating potential impacts of hurricanes and flooding on the project, and impacts from Hurricane Katrina in particular. The overarching purpose, goals, and objectives of the project are to improve efficiency and reliable passage of waterborne traffic locking through the IHNC, by reducing transit times of waterborne traffic locking through the IHNC with a new replacement lock capable of handling today’s waterborne commerce needs. Furthermore, since the existing IHNC navigation lock was constructed in 1923, operation and maintenance costs have increased due to the increasing frequency of maintenance events that result in additional delays, in addition to delays caused by the limited capacity of the existing navigation lock, or a complete closure of the lock to waterborne traffic. This delay is a result of the existing lock’s limited capacity relative to prevailing levels of traffic and the size of tows navigating the GIWW and Mississippi River that utilize the lock. The processing time for a tow entering and exiting the lock is nearly 44 minutes on average meaning the delay for a tow just to enter the existing lock is more than 15 hours. The average transit time for a tow using the existing IHNC navigation lock is more than 16 hours. The existing IHNC navigation lock (640 feet long by 75 feet wide by 31.5 feet deep) is not efficient. The canal also connects the eastern segment of the Gulf Intracoastal Waterway (GIWW) with the Mississippi River. It joins Lake Pontchartrain to the north with the Mississippi River to the south. The IHNC Lock is located in the Industrial Canal which runs through a highly urbanized area within the New Orleans city limits.

It is commonly referred to as the IHNC (Inner Harbor Navigation Canal) Lock Replacement Study.

Mississippi River, Baton Rouge to the Gulf of Mexico Mississippi River-Gulf Outlet, Louisiana, New Industrial Canal Lock and Connecting Channels Project.

Usace lock queue report