Mississippi River, Lock and Dam 18, Gladstone IL/Burlington IA, 15 Barge "Split Tow" 2023

Mississippi River Lock & Dam 18 at Gladstone IL, near Burlington IA.
On this day we see a 15 barge tow that is split in half to traverse the lock.
This is attempting to show with some detail how this is done.
The first nine barges are pushed into the lock, they are then disconnected and raised in the lock.
A winch then pulls them through to clear the lock.
Next the towboat and remaining six barges enter and are raised.
Finally, everything is connected back together and the tow exits to continue northbound.