Designated as a Scenic Landscape Unit in the Sonoma County 2020 General Plan Open Space and Resource Conservation Element.
Bridge in the Historic District (HD) and Sonoma Creek in the F2 Floodplain, Biotic Resources (BR), Valley Oak Habitat (VOH) and Scenic Resource (SR) combining districts.
The proposed bridge project would be located on Watmaugh Road where it crosses Sonoma Creek. The project would construct a replacement bridge within the approximate alignment of the existing bridge. The new bridge would be a two span pre-stressed concrete box girder that would be ~185 feet in length. The new bridge would be 32 feet wide, consisting of two 11-foot travel lanes and two foot shoulders. The approach roadway width would also be widened to about 32 feet and taper until it conforms to the existing roadway at each end of the bridge.
To construct the new bridge, Cast in Drilled Hole (CIDH) concrete piers would be drilled into the banks of the creek at the location of the abutments and at the center pier, with the number and size of the CIDH piers to be determined prior to construction, based upon the results of a geotechnical report. Additional rock slope protection (RSP) may be included with the proposed bridge replacement. Prior to removal of the existing bridge, a debris catching platform would be constructed under the bridge. The platform would be supported by the existing structure over the water and would function to prevent concrete debris from falling into the creek during removal of the existing bridge deck.
Sonoma County Permit and Resource Management Department
Aesthetics, Air Quality, Biological Resources, Cultural Resources, Hazards & Hazardous Materials, Land Use/Planning, Transportation, Mandatory Findings of Significance
California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Highway Patrol, California Native American Heritage Commission (NAHC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Lands Commission (SLC), Department of Water Resources, Resources Agency, California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)
Reviewing Agency Comments
California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)
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