The Chilo Lock and Dam #34 closed in 1964 when the new Meldahl Locks and Dam opened. The larger high-lift dam raised the river's navigation channel to a minimum of 12 feet, eliminating the need for Chilo and three other upstream wicket dams. Boats no longer have to lock through as frequently, saving time, and the deeper channel allows the passage of boats with heavier loads. Meldahl Dam has two locks, one 600 feet long and one 1200 feet long. Because the lock at Chilo was only 600 feet long, a boat with a full 15-barge tow had to split its load and lock through twice, while a 1200 foot lock chamber allows boats to lock through in one pass.