Tomorrow, a VIP ceremony will be held on the banks of the canal to inaugurate the completion of the works.
President Juan Carlos Varela will unveil the new locks and third shipping lane built into the 102-year-old canal. Foreign dignitaries, including the presidents of Taiwan, Chile and other Central American nations, will be present at the ceremony.
A Chinese-owned Neopanamax-class cargo ship will be the first vessel to officially test the new infrastructure, entering from the Atlantic and exiting into the Pacific a few hours later.
The expansion work began in 2007 and was meant to have been completed in 2014, but it ran well past deadline, and over budget.
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The expansion is estimated to have cost USD 5.5 billion. However, outstanding disputes between the Spanish- and Italian-led consortium that carried out the work and the Panamanian government could yet hike that figure by hundreds of millions more.
For Panama, the unveiling of the broader canal is a moment of pride and of opportunity.
Annual cargo volumes should double over the next decade, leading Panama to hope to triple the USD 1 billion in shipping fees it receives each year.
Also, with the country these days linked to the "Panama Papers" scandal of offshore businesses owned by the world's wealthy and influential, the expanded canal is seen as a chance to burnish the country's tarnished image.
This will show the "real face of Panama," Panama Canal Authority (ACP) chief Jorge Quijano told AFP in an interview this week.