At the northern end of the San Joaquin River Viaduct, girders have been set and a cast-in-place concrete arch is underway for the section that crosses over the river. Concrete is being poured for the deck segments on the north side of the river, while further south, crews continue constructing barrier and intrusion protection walls along the sides of the pergola section of the viaduct. The completed viaduct, nearly a mile in length, will be one of the largest structures on this first phase of the high-speed rail project.