Cooperstown Road over Rydberg Creek Bridge (No. 38C0257) Replacement Project

Cooperstown Road over Rydberg Creek Bridge (No. 38C0257) Replacement Project

The Stanislaus County Public Works Department (County) in coordination with the California Department of Transportation, proposes to replace the existing Rydberg Creek Bridge (No. 38C0257) on Cooperstown Road to provide improved safety and operations on the facility, with a new two­ lane bridge in the same location as the existing bridge. The project would be federally funded through the Federal Highway Bridge Program, which is administered by the California Department of Transportation (Caltrans) on behalf of the Federal Highway Administration. Caltrans is responsible for federal oversight of the project, which would be locally administered by the County. The existing bridge is County owned and maintained. The proposed new bridge would be a single span, cast-in-place, reinforced concrete, box girder bridge. It would be 92 feet long by 28 feet wide with a clear width of 24 feet (two 10-foot lanes and 2-foot-wide shoulders on each side) to meet the American Association of State Highway and Transportation Officials Standards. Type 85 concrete barrier railings would be installed on each side of the bridge. The box girder bridge would be supported on two abutments and would span the active channel. Rock slope protection would be placed around the abutment embankments to prevent scour. Cast-in-drilled-hole piles would be used for the foundation. The bottom of the abutment footings would be approximately 15 feet below the original ground elevation. The soffit of the new bridge would provide at least 6.5 feet of freeboard over the 100-year storm water surface elevation of Rydberg Creek. The roadway would remain unpaved, but the approaches to the bridge would be widened to match the bridge width (32 feet). To improve the existing non-standard sight distance, the bridge profile would be raised approximately 4 feet. The project would be aligned within the existing County ROW for Cooperstown Road, but construction would encroach onto neighboring private land. Due to the low average daily trips and long detour distance on County roads (approximately 20 miles), the bridge would be closed during construction while traffic would use a temporary detour adjacent to the existing Cooperstown Road. This temporary detour would be approximately 15 feet wide and would be located just south of Cooperstown Road. Traffic would cross Rydberg Creek via a low-water crossing because the creek is dry for several months during the summer. The low-water crossing would be constructed by laying a temporary pipe atop the creek bed perpendicular to the road and covering it with clean crushed rock. The pipe and rock used for the temporary crossing would be removed at the end of construction. The existing bridge would be demolished and removed from the project area as construction progresses. Construction is anticipated to begin in May 2026 and is proposed to take approximately 8-10 months to complete.

La Grange

Stanislaus

Citywide, Countywide

California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 10 (DOT), California Department of Water Resources (DWR), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Transportation Commission (CATC), Central Valley Flood Protection Board, Delta Protection Commission, Delta Stewardship Council, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights, California Department of Fish and Wildlife, Central Region 4 (CDFW), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB)

California Department of Fish and Wildlife, Central Region 4 (CDFW), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB)

Transportation:Other (Bridge Replacement)

Transportation

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Flood Plain/Flooding, Geology/Soils, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Solid Waste, Vegetation, Wetland/Riparian, Wildfire, Archeological/Historical/Water Supply/Groundwater/Traffic/Circulation