Philo-Greenwood Road over Navarro River Bridge (10C-0032) Rehabilitation and Widening Project

Philo-Greenwood Road over Navarro River Bridge (10C-0032) Rehabilitation and Widening Project

Mendocino County Department of Transportation (County) is proposing to rehabilitate and widen the Bridge No. 10C-0032 on Philo-Greenwood Road over the Navarro River. The County has nominated this bridge for rehabilitation under the federal-aid Highway Bridge Program administered by the Federal Highway Administration through the California Department of Transportation (Caltrans) Division of Local Assistance. In 2010, Caltrans determined that the bridge was structurally deficient and functionally obsolete due to a variety of factors, including a narrow deck (i.e., one-lane bridge) and rotting timbers. The rehabilitated bridge would meet current design standards of Mendocino County, American Association of State Highway and Transportation Officials, and Caltrans. The project would widen and rehabilitate/retrofit the existing arch span and replace the timber approach spans with a new concrete approach structure. The existing structure consists of 15 spans for a total length of approximately 350 feet including abutments. Twelve of these approach spans composed of timber and are on the northern end of the existing bridge. The remaining three are concrete, characterized by open spandrel arch construction. The existing 19-foot-wide deck over the arch spans is bare concrete while the timber approach spans subfloor is covered with an asphalt concrete overlay. The 12 timber approach spans would be replaced with a three-span concrete approach structure. The bridge deck and arch span would be widened to meet the capacity requirements of the roadway facility and rehabilitated/retrofitted to meet current design code load requirements.

Ukiah

Mendocino

Countywide, Northern California, Unincorporated

California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Northern and Eureka Region 1 (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 1 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, North Coast Region 1 (RWQCB), California State Lands Commission (SLC), Office of Historic Preservation, State Water Resources Control Board, Division of Water Quality

Transportation:Local Road (Philo-Greenwood Road)

Site Plan, Transportation

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, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire