REPORT TO COUNCIL
SUBJECT
Title
Adopt the Mitigated Negative Declaration and Mitigation Monitoring and Reporting Program for the Old Mountain View-Alviso Road Bridge Replacement at Calabazas Creek Project, and Approve Proceeding with the Project.
Report
BACKGROUND
The Old Mountain View-Alviso Road Bridge (Caltrans Bridge No. 37C-0254) is located on Old Mountain View Road between Patrick Henry Drive and Reamwood Avenue. It crosses over Calabazas Creek and is jointly shared between the City of Sunnyvale to the west and the City of Santa Clara to the east (Attachment 1 - Location Map). There is also a recreational trail that runs along the creek's east side, under the bridge. The bridge was constructed in the mid-1960s, widened in 1974, and seismically retrofitted in1991 and 1997. It is a narrow, five span structure that is approximately 32 feet in total width and 113 feet in length, with four sets of piers in the creek channel. It has two 14-foot wide traffic lanes, no sidewalks and four-foot high barriers/floodwalls along each edge. The barriers/floodwalls on the bridge tie directly into the existing floodwall system along Calabazas Creek.
A bridge inspection performed by California Department of Transportation (Caltrans) in April 2012 listed the bridge as "structurally deficient' with a bridge sufficiency rating of 49.7. Elements that influenced this rating include moderate to severe deck cracking and spalling, delaminated concrete, speckled rust and flaking on steel members, inadequate bicycle and pedestrian access, and being within the 100-year floodplain. Due to these deficiencies, the bridge is on the Federal Highway Administration (FHWA) Eligible Bridge List (EBL) and is therefore eligible for Caltrans-administered Federal Highway Bridge Program (HBP) funding for the design, right-of-way, and construction activities related to the project. When construction is completed, the bridge will be removed from the EBL.
A contract for design of this ...
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