At the northern end of the San Joaquin River Viaduct, workers are busy with concrete pours as the cast-in-place structure gets closer to the river. Further south, crews have begun constructing barrier walls along the sides of the pergola section of the viaduct. On the south bank of the San Joaquin River, crews are finishing up construction of the remaining support columns, while on the north bank of the river the final pier cap has been poured. The completed viaduct will form one of the largest structures on this first phase of the high-speed rail project.