The Fresno Trench is an approximately one mile long trench north of downtown Fresno that will carry high-speed trains under State Route 180, a rail spur, and an irrigation canal. The trench parallels Union Pacific freight tracks and includes an intrusion barrier wall to keep high-speed and Union Pacific trains separate. At its deepest point the trench will be about 40 feet below grade.
From approximately Olive Avenue to Stanislaus Street. Work on the trench has begun south of Belmont Avenue along with excavation beneath SR 180.
Workers on the State Route 180 trench, a little north of downtown Fresno, direct a concrete pump as it pours 300 cubic yards of concrete to create a section of wall. The crews are constructing a box that will carry trains under the highway, a rail spur and the Dry Creek Canal. As that concrete sets, the forms will be moved to another section of the tunnel and the process repeated. Other sections of the tunnel rebar are still being tied in preparation for a concrete pour, while the final step will be to construct a lid to enclose the entire structure. The walls, floor and lid will all consist of solid concrete, five feet thick.