How Many Locks Does the Panama Canal Have

How many locks in the Panama Canal depends on which system you mean. The original 1914 canal has three lock complexes, Gatun, Pedro Miguel and Miraflores, while the newer locks completed in 2016, Agua Clara and Cocoli, added a fourth and fifth complex built specifically for larger Neopanamax ships. The confusion between “three locks” and “five locks” is one of the most common questions visitors ask before booking a tour.

This page breaks down what each lock complex does, why the canal needs locks in the first place, and how many you actually pass through if you book a tour, whether that means a land based visit or a full boat transit.

How Many Locks Did the Original Panama Canal Have?

The original canal, completed in 1914, has three lock complexes: Gatun on the Atlantic side, and Pedro Miguel and Miraflores on the Pacific side. Each complex uses twin, parallel chambers so ships can transit in both directions at the same time, which is why you will sometimes see the count described as six chambers across three complexes rather than simply “three locks.”

Together, these three complexes lift a ship from sea level up to Gatun Lake, roughly 26 meters (85 feet) higher, then lower it back down to sea level on the opposite coast. Each individual chamber measures about 33.5 meters (110 feet) wide and 320 meters (1,050 feet) long, dimensions that defined the maximum ship size, known as Panamax, that could transit the canal for over a century until the 2016 expansion changed that limit.

What Is Each of the Three Original Locks Called?

Gatun Locks sit on the Atlantic side and use three chambers in a single flight to do the entire lift from sea level up to Gatun Lake in one continuous climb. Pedro Miguel Locks, on the Pacific side, use a single chamber to lower ships from Gatun Lake down to the small artificial Miraflores Lake. Miraflores Locks, the most visited of the three, use two chambers to complete the final drop from Miraflores Lake down to Pacific sea level.

That last step is why Miraflores is the site most tour operators build a visit around: its two chamber system sits closest to Panama City and offers the most developed visitor infrastructure of any of the three original complexes. The observation terraces there put visitors within a few meters of the actual chamber walls, close enough to watch the water level shift within minutes once the valves open. The Miraflores Locks tour guide covers what a visit there actually involves.

How Many Locks Were Added in the 2016 Expansion?

The 2016 expansion, known as the Third Set of Locks Project, added two new lock complexes: Agua Clara on the Atlantic side, near the original Gatun Locks, and Cocoli on the Pacific side, near the original Miraflores and Pedro Miguel Locks. Each of these newer complexes uses a single flight of three chambers to complete the full lift or drop in one structure, rather than splitting the work across two separate complexes the way the original Pacific side locks do.

These wider, deeper chambers were purpose built for Neopanamax vessels, ships too large to fit the original 1914 locks, and their opening roughly doubled the canal’s total cargo capacity. Each Neopanamax chamber measures about 55 meters (180 feet) wide and 427 meters (1,400 feet) long, considerably larger than the original 1914 dimensions, which is what allows today’s biggest container ships to use the canal at all.

Unlike the original locks, the Agua Clara and Cocoli complexes were also built with adjacent water saving basins that capture and reuse a large share of the fresh water from each lockage rather than letting it drain straight to the sea, a design choice made specifically to reduce the strain on Gatun Lake’s water supply.

How Many Locks Are There in the Panama Canal Today in Total?

Counting complexes, the modern Panama Canal has five lock complexes: the three original ones, Gatun, Pedro Miguel and Miraflores, plus the two Neopanamax complexes, Agua Clara and Cocoli. Counting individual chambers instead, the total works out to twelve, six in the original system and six in the expansion locks, since each side of both systems needs matching chambers for two way traffic.

Most everyday references to “the Panama Canal’s locks” mean the original three complexes, since those are the ones tour operators and visitor centers focus on, while the expansion locks are generally viewed by cargo ship enthusiasts and from designated viewing points rather than guided tourist visits. If someone asks how many locks you passed through on your own visit, the honest answer usually depends on whether you took a land based tour of a single complex or a boat transit through two or three of them in a single day.

Why Does the Panama Canal Need Locks At All?

The Isthmus of Panama rises well above sea level at its center, so engineers needed a way to lift ships up and over that terrain rather than digging an extremely deep channel straight through it. The lock system solves this by using Gatun Lake, an artificial lake formed by damming the Chagres River, as a kind of staircase landing partway up the elevation change.

Each lock chamber floods or drains using gravity fed water from the lake rather than mechanical pumps, which is part of why the surrounding rainforest watershed is protected as essential infrastructure rather than incidental scenery. Water moves through large culverts built into the chamber walls and floor, filling or draining an entire chamber in roughly 8 to 10 minutes, a process visible from the observation terraces as the water level visibly rises or falls around the ship inside.

For more on how this lift actually works step by step, including the history behind why engineers chose a lock system over a sea level cut, see the Panama Canal facts overview.

How Many Locks Do You Go Through on a Tour?

A partial transit boat tour typically takes you through the Miraflores and Pedro Miguel Locks, two of the three original complexes, before ending on Gatun Lake. A full transit tour adds the Gatun Locks as well, meaning you pass through all three original lock complexes in a single day, from the Pacific all the way to the Atlantic.

If you would rather watch from a fixed platform instead of riding through the chambers, a Miraflores Locks visit lets you see that complex’s two chambers in action without booking a boat at all. For the story behind why the canal needed locks in the first place, see the Panama Canal history page, and for how much ships actually pay to use them, see the Panama Canal revenue page.

Either way, you will not typically transit the newer Agua Clara or Cocoli locks on a standard tourist trip, since those complexes serve commercial Neopanamax traffic almost exclusively and are viewed from designated points near Colon rather than boarded directly by tour boats.

Insider Tips for Understanding the Lock System

Knowing the names and order of the locks before you go makes a huge difference in following what your guide is explaining in real time, especially the distinction between the original three complexes and the newer expansion locks most tours do not visit directly. Morning departures also tend to offer the best odds of catching an active transit at whichever complex your tour visits, since a meaningful share of daily shipping traffic moves earlier in the day.

If you are choosing between a Miraflores only visit and a longer partial or full transit, remember that the lock count is only part of the decision. A land based Miraflores visit shows you two chambers up close in about half a day, while a boat transit trades a longer, more expensive day for the experience of actually riding through two or three lock complexes yourself.

Ready to see the locks yourself? Compare the full range of Panama Canal tour options to decide between a land based visit and a boat ride through the chambers before you book.

Frequently Asked Questions

How many locks does the Panama Canal have in total? Five lock complexes exist today: the three original ones, Gatun, Pedro Miguel and Miraflores, plus the two 2016 expansion complexes, Agua Clara and Cocoli.

How many locks are in the new Panama Canal? The 2016 expansion added two new complexes, Agua Clara on the Atlantic side and Cocoli on the Pacific side, each using a single flight of three chambers.

How many locks do you go through on a partial transit tour? A partial transit typically covers two lock complexes, Miraflores and Pedro Miguel, before the boat reaches Gatun Lake.

Which lock complex do most tourists visit? Miraflores, since it sits closest to Panama City and has the most developed visitor center of any of the five complexes.

Do tours visit the newer Agua Clara or Cocoli locks? Most standard tourist visits focus on the original three complexes rather than the newer expansion locks, though dedicated viewing points near Agua Clara exist for visitors on the Atlantic side.