Chimney Rock Road at Franklin Creek Bridge Project, 300713/ED24-067

Chimney Rock Road at Franklin Creek Bridge Project, 300713/ED24-067

The purpose of this project is to provide a permanent two-lane bridge for vehicle crossing to replace a temporary steel truss bridge that was installed in 2023 when the previous permanent roadway was destroyed during winter storms in January and March 2023. The proposed permanent bridge would consist of a clear span, cast-in-place concrete box girder superstructure that would measure 175 feet long and 30 feet wide, with two 10-foot-wide travel lanes, two 3-foot-wide shoulders, and 2-foot-wide concrete barriers on each side. The proposed bridge profile grade and alignment would be consistent with the existing roadway. Traffic will be accommodated during construction with a temporary detour (comprised of fill) directly adjacent to the south side of the proposed bridge. Construction activities would occur over a period of 9 months and are anticipated to begin in May 2025. Construction will be scheduled during the non-rainy season when conditions are dry, or creek flows are at their lowest, however creek diversion and dewatering may be required. Avoidance, minimization, and mitigation measures will be implemented to ensure project impacts are less than significant. The project location is located within the Nacimiento Subarea of the North County Planning Area, Supervisorial District 4, approximately 15 miles northwest of Highway 101 and Paso Robles in a rural, unincorporated area of the county. The County of San Luis Obispo (County) Public Works Department proposes to construct a new permanent bridge over Franklin Creek to replace an existing temporary steel truss bridge. The Chimney Rock Road at Franklin Creek Project (project) is located on Chimney Rock Road at the intersection of Fawn Lane, crossing Franklin Creek, in a rural, unincorporated area of the county, approximately 15 miles northwest of U.S. Highway 101 (US 101) and on the southern arm of Lake Nacimiento.

Lake Nacimiento

San Luis Obispo

Unincorporated

California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Central Region 4 (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 5 (DOT), California Department of Water Resources (DWR), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Central Coast Region 3 (RWQCB), California State Lands Commission (SLC), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality

Transportation:Local Road (Bridge replacement)

PW Project

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire