TO: Board of Supervisors
FROM: Steven Lederer, Director of Public Works
REPORT BY: Frank Lucido, Engineering Manager
SUBJECT: Construction Contract Award for the "Rossi Bridge Phase 1", RDS 25-25 project.
RECOMMENDATION
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Award a Construction Contract to Granite Rock Company for the "Rossi Bridge Phase 1," RDS 25-25 project (Fiscal Impact: $956,275 Expense; Capital Improvement Projects Fund; Budgeted; Discretionary)
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BACKGROUND
The crossing on Rossi Road that bridges over Conn Creek is unique in that it was originally constructed by private owners in the early 1900's by placing three iron culverts in the creek and placing soil on top which partially impounded the creek. In the late 1920's the County assumed responsibility for the road and constructed an additional concrete box culvert and headwall to allow for more capacity. In early February of 2025, a storm event caused significant damage around Napa County including the Rossi Crossing. One of the iron culverts collapsed and the concrete headwall was severely damaged.
The County Board ratified a local emergency proclamation on February 18, 2025, and approved $2,000,000 in funding for the Rossi Road Bridge Repair Project. On March 11, 2025, the Board approved a $348,447 contract with Adko Inc., who was previously selected in a request for qualifications process for storm repair projects to continue design work and environmental review. The final design and environmental documents were submitted to local, state and federal agencies, however permission to work in the creek has not been granted yet. This phase of the project will focus on constructing improvements outside of the creek prior to this coming winter which will make it possible to launch a bridge more quickly if the existing impound fails. During construction the crossing, which is the only public access to a business and 7 or 8 residences will be closed during the weekdays for several weeks. The County entered into an agreement with a priv...
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