When Was the Panama Canal Completed? The Historic First Transit

The Panama Canal was officially completed and opened to traffic on August 15, 1914, when the SS Ancon, an American cargo and passenger ship, made the first official transit from the Atlantic to the Pacific.

Key Dates

• October 10, 1913: The Gamboa Dike was demolished, flooding the Culebra Cut and joining the Atlantic and Pacific waters for the first time (ceremonial "wedding of the oceans").
• August 15, 1914: Official opening; SS Ancon transit.
• July 12, 1920: Formal dedication ceremony (delayed by WWI).

Construction Timeline

• French Period (1881–1899): Failed attempt under Ferdinand de Lesseps.
• U.S. Period (1904–1914): 10 years, ~$375 million (equivalent to ~$11 billion today), ~56,000 workers, ~5,600 lives lost (mostly to disease).
• Chief Engineers: John F. Stevens (1905–1907), George W. Goethals (1907–1914).

Historical Context

The canal opened just days after the outbreak of World War I. Its strategic value for naval mobility and global trade was immediately apparent. The U.S. controlled the Canal Zone until 1999, when sovereignty was transferred to Panama under the Torrijos-Carter Treaties (1977).

Note: Some sources cite October 12, 1913 (dike demolition) as the "completion" date, but August 15, 1914 is the universally recognized operational opening.