[1] According to the New York Times, in 2015 72.3 million tonnes of cargo transited the lock, making it the second biggest and most economically important, in the United States, after nearby Lock and Dam Number 52.

[2] According to the New York Times, the Olmsted project was scheduled to have been completed in 1998.

[2] In November 2016, the New York Times reported the Olmsted project was then scheduled to be complete in October 2018.

The New York Times reports that the United States Army Corps of Engineers, the Federal agency responsible for maintaining navigation on the USA's rivers, the delay in replacing the lock complex with the Olmsted project costs $640 million per year.

[2] Landside demolition was completed in 2021, but underwater structure removal was ongoing through 2022.