As part of the Panama Canal Long Range Master Plan, the Panama Canal Authority (ACP) initiated in 1997 the expansion of the capacity of the waterway. The Expansion Project included the construction of additional locks and navigation channels to allow the transit of Post-Panamax vessels. This project required a new navigation channel to connect the Gaillard Cut with the new Pacific Locks. This channel was designated as the Pacific Approach Channel (PAC). The channel is approximately 7.8 km long, 218 m wide, with a water elevation at 26.82 m PLD (Precise Level Datum for the Panama Canal) and is separated from the Miraflores Lake (elevation 16.45 m PLD) by a new dam. ACP divided the Pacific Approach Channel works into four separate construction packages. One of those package, named PAC-4 included the construction of one of the two embankment dams required to separate the new access channel from the Miraflores Lake, that have a difference elevation of almost ten meters. These dams were designated as Borinquen 1E and 2E; the last one was included in the Locks Contract while the Borinquen 1E dam was built during the PAC-4 contract. The design of the PAC-4 required that the contractor excavate to ground elevations below the Miraflores Lake level. Therefore, it was required the construction of a cellular cofferdam and an embankment cofferdam in order to provide the adequate conditions for the required excavation works. This cofferdam was designed by the ACP design team and the review process was performed by URS Corp., who was the consultant in charge of the design of the embankment 1E. The paper describes the design criteria assumed; the possible additional uses of this structures once the new canal is in operation; and the construction process itself.