Mira Flores Locks. All the lock chambers in the Panama Canal are 110 ft wide by 1050 ft long. Ships are raised or lowered a total of 85 ft. On the Atlantic side, the three steps of the Gatun locks is 85 ft; the lift of the two-step Mira Flores locks (which is where we are now) is 54 ft. The lift at Mira Flores actually varies due to the extreme tides on the Pacific side, between 43 ft at extreme high tide and 64.5 ft at extreme low tide; the tides on the Atlantic side, however, are very small.
The lock chambers are massive concrete structures. The side walls are from 45 to 55 feet thick at the bases; towards the top, where less strength is required, they taper down in steps to 8 ft. The center wall between the chambers is 60 ft thick, and houses three long galleries which run the full length of the center wall. The lowest of these is a drainage tunnel; above this is a gallery for electrical cabling; and towards the top is a passageway which allows operators to gain access to the lock machinery.