Federal officials are marking the expansion of a pedestrian annex building at the San Luis, Arizona port of entry on the border with Mexico.
The crossing is south of Yuma, where Arizona and California meet on the border with Sonora, Mexico.
Representatives of the U.S. General Services Administration, the U.S. Department of Homeland Security's Customs and Border Protection agency and the city of San Luis are expected at the Wednesday morning event. Mexican officials have also been invited to attend.
The $6 million project added an 8,000-square-foot (743-square-meter) building to the port that expands the capacity from seven to 10 booths for processing people crossing the border on foot.