TO: Napa County Flood Control and Water Conservation District
FROM: Richard Thomasser, PG – District Manager
REPORT BY: Andrew Butler, PE – District Engineer
SUBJECT: Approval of Plans and Specifications and Authorization to Advertise for Bids for Napa River/Napa Creek Flood Protection Project, Floodwalls North of the Bypass, Increment 2
RECOMMENDATION
title
Approve Plans and Specifications for Napa River/Napa Creek Flood Protection Project, Floodwalls North of the Bypass, Increment 2 and authorize the advertisement for sealed bids, and opening of the bids at a time, date, and location to be published by the District Manager pursuant to Public Contract Code section 20150.8. (No Fiscal Impact)
body
BACKGROUND
In 2023, the Napa County Flood Control and Water Conservation District (NCFCWCD) and United States Army Corps of Engineers (USACE) entered into a Memorandum of Understanding (MOU) for design work prior to execution of a 204 Project Partnership Agreement for the Project. The Flood Control Acts of 1965 (P.L. 89-298), Sec. 204, and 1976 (P.L. 94-587), Sec. 136(a), authorized the Project. The total project costs based on FY 2023 price levels are estimated to be $515M. The Project received Federal funding in the amount of $48.3M with the non-Federal sponsor responsible for all other costs to complete the Project. Section 204(b) of the Water Resources Development Act of 1986, as amended (33 U.S.C. 2232), authorizes non-Federal interests to construct certain water resources development projects, with potential credit or reimbursement of the Federal share of that construction.
The NCFCWCD was engaged in the task of completing the final design of Increment 2, now called the Floodwalls North of the Bypass Project. These floodwalls extend between the Napa River Bypass to just south of the Elks Lodge along the west bank of the Napa River in the City of Napa. The project will also complete the floodwalls at the bypass channel by closing two “gaps” that were left to allow for overland flows that could exist during flood events in the interim situation. With the completion of the rest of the Floodwalls North of the Bypass Project improvements, these gaps will no longer be necessary.
The final design for the Napa River/Napa Creek Flood Protection Project, Floodwalls North of the Bypass, Increment 2, was completed in 2025. The engineers estimate for constructing the project is $34,671,833 and the attached map, Exhibit A, shows the location of the entire Napa River/Napa Creek Flood Protection Project including the subject project Floodwalls North of the Bypass, Increment 2.
Requested Actions:
1. Approve plans and specifications for the Napa River/Napa Creek Flood Protection Project, Floodwalls North of the Bypass, Increment 2
2. Authorize advertisement for sealed bids for the project and opening of the bids at a time, date, and location to be published by the District Manager pursuant to Public Contract Code section 20150.8.
FISCAL & STRATEGIC PLAN IMPACT
|
Is there a Fiscal Impact? |
No |
|
Is it Mandatory or Discretionary? |
Discretionary |
|
Discretionary Justification: |
Without construction of the floodwall, the District will be unable to complete the Napa River/Napa Creek Flood Protection Project. |
|
Is the general fund affected? |
No |
|
Consequences if not approved: |
The District will be unable to complete construction of the project. Without construction of the floodwall, the City of Napa will be susceptible to riverine flooding as it is today, and the District will not be able to request reimbursement from the USACE. |
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: The Floodwalls North of the Bypass Project (FNBP), Increment 2 of the Napa River/Napa Creek Flood Protection Project, was included in the final Environmental Impact Report (FEIR) for the Project that was certified by the District on May 4, 1999, for which a Notice of Determination was filed on May 7, 1999. The Final Supplemental Impact Statement (FEIS) for the Project was certified by the USACE in its Record of Decision filed on June 9, 1999. On March 25, 2025, after a 45-day public review and response to comments, the District Board certified the Final Subsequent Environmental Impact Report for the FNBP which addressed changes to the original design in some areas within the footprint of that project. The U.S. Army Corps of Engineers circulated a Draft Supplemental Environmental Assessment/ Finding of No Significant Impact for the FNBP during a 30-day review period May 22, 2025, to June 20, 2025. After the public and agency review period, the U.S. Army Corps of Engineers responded to comments and prepared the Final Supplemental Environmental Assessment/ Finding of No Significant Impact.