The Project includes the replacement of the existing 3-span, 180-foot-long deck plate girder open deck bridge. UPRR plans to replace the entire bridge with three 69-foot beam span ballast deck-bridge girders, one 45-foot pre-stressed concrete box (PCB) girder on the north side, and timber ties. The new bridge will total 252-feet in length and have an opening area of 3,429-square feet. Upland Project activities include removal and replacement of existing northern and southern abutments, construction of new backwalls, and other activities. The southern abutment will be moved approximately 35 feet south, and the northern abutment will be moved approximately 25 feet north. The banks on either side of the new abutments will be regarded to a 2:1 slope and Class 2 riprap will be placed from the abutment to the edge of, but not internal to, the ordinary high water mark (OHWM) for bank stabilization.
The Project will result in permanent impacts to 0.002-acres of Central Valley Spring-Run Chinook Salmon (Oncorhynchus tshawytscha) habitat including temporary impacts to 0.01 acres; however, the Project will result in a net increase of approximately 0.004-acres of Central Valley Spring-Run Chinook Salmon habitat due to the new design requiring less pier, abutment, and riprap area below the top of bank compared to the current bridge. The project is expected to result in incidental take of Central Valley Spring-Run Chinook Salmon, which is designated as a threatened species under the California Endangered Species Act. The ITP referenced above as issued by CDFW authorizes incidental take of species listed under CESA that may occur as a result of Project implementation.