Why does the Panama Canal use locks instead of a sea-level channel?

The Panama Canal utilizes a lock system rather than a sea-level channel primarily due to the challenging topography of the Isthmus of Panama. Early attempts to construct a sea-level canal failed because the terrain, which includes the Continental Divide and the volatile Chagres River, was ill-suited for such a design.12

Engineers eventually adopted a high-level lock design, a plan originally proposed by Adolphe Godin de Lépinay. This approach involves:12

• Creating Artificial Lakes: By damming the Chagres River, engineers formed Gatun Lake and other reservoirs, which serve as the primary water source for the canal's operation.345
• Lifting and Lowering Vessels: Instead of excavating the entire route to sea level, the locks lift ships approximately 85 feet (26 meters) above sea level to traverse the interior of the isthmus through the Gaillard Cut and then lower them back to sea level on the opposite side.657

This system allows the canal to navigate the mountainous terrain efficiently while managing the region's significant rainfall and river flow.14