The United States and the new Republic of Panama signed the Hay–Bunau-Varilla Treaty, giving the U.S. the rights to build and control a canal corridor across Panama. The agreement created the legal basis for the U.S.-run Canal Zone and made U.S. construction possible.
The U.S. government created the Isthmian Canal Commission (ICC) to organize and supervise the canal project. This commission became the main administrative body for planning, hiring, and managing work in the Canal Zone.
The United States officially took control of the canal effort and began the American phase of construction. Early work focused on restarting operations after the failed French attempt and building the capacity to move huge amounts of earth and supplies.
John Findley Wallace served as an early chief engineer, but progress remained slow and organizational problems continued. His resignation became a turning point that pushed U.S. leaders to change management and methods to get the project moving.
John Frank Stevens became chief engineer and emphasized practical logistics: rebuilding rail lines, improving housing, and strengthening supply systems. His approach treated excavation as a large-scale transportation problem—how to dig and remove earth efficiently—while also pushing sanitation as a prerequisite for sustained work.
U.S. decision-makers committed to a canal using dams and locks, rather than a sea-level canal. This choice shaped the entire build: it required major structures such as Gatun Dam, a large artificial lake, and a lock system to lift ships above sea level and lower them again.
Work began on Gatun Dam, an earth dam across the Chagres River. The dam would create Gatun Lake, provide a stable water supply for the locks, and turn an unpredictable river system into a controlled part of the canal’s design.
After Stevens resigned, President Theodore Roosevelt selected Army engineer George Washington Goethals to lead the ICC and canal construction. Under Goethals, the project shifted toward tighter, centralized management to speed decision-making and keep work moving.
Congress passed the Panama Canal Act, authorizing the U.S. government to set canal tolls and defining key rules for opening and operating the canal. This law shifted the project toward its end goal: a working transportation system with an operating framework, not just a construction site.
Closing gates at Gatun Dam began flooding the valley to form Gatun Lake, a central feature of the canal. The lake turned a large section of the crossing into open water, reducing the amount of digging needed and providing the water required for lock operations.
A telegraph signal from President Woodrow Wilson set off an explosion that destroyed the Gamboa Dike, letting water flood into the Culebra Cut. This step connected major sections of the waterway, moving the canal from separate construction zones toward a continuous route.
During final construction and testing, the French-built floating crane Alexandre La Valley became the first vessel to make a complete transit of the canal under its own power. This passage demonstrated that the route could be navigated end-to-end before the formal opening.
The cargo ship SS Ancon completed the first official transit as the Panama Canal opened to world shipping. The opening marked the practical outcome of the U.S. construction effort: a working interoceanic route that cut travel distance compared with sailing around South America.
U.S. Construction of the Panama Canal (1904–1914)