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

2 Documents in Project


SCH Number
Lead Agency
Mendocino County
Document Title
Philo-Greenwood Road over Navarro River Bridge (10C-0032) Rehabilitation and Widening Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
General Plan Designation: Anderson Valley Community Planning Area Zoning: Agricultural District (AG 40), Rangeland District (RL160)
Document Description
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.

Contact Information

James Linderman
Agency Name
Mendocino County Department of Transportation
Job Title
Senior Environmental Complaince
Contact Types
Lead/Public Agency / Project Applicant


Countywide, Northern California, Unincorporated
Cross Streets
State Route 128/Philo-Greenwood Road
Total Acres
Parcel #
026-530-10, -03, -04, -05, -09; 026-360-01, -55
State Highways
State Route 128
Navarro River
Other Location Info
Located in the unincorporated area of Mendocino County, 3.7 miles northwest of the community of Philo, California. Approximately 0.4 mile west of State Route 128 intersection at Philo-Greenwood Road.

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
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 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), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Water Quality
Development Types
Transportation:Local Road (Philo-Greenwood Road)
Local Actions
Site Plan, Transportation
Project Issues
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
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form

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