TO: Board of Supervisors
FROM: Steven Lederer - Director of Public Works
REPORT BY: Graham Wadsworth, PE - Engineering Supervisor
SUBJECT: Certification of County-Maintained Road System Mileage
RECOMMENDATION
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Adopt a Resolution submitting to the State Department of Transportation the total mileage of Napa County maintained roads as of April 2026 so that the State Department of Transportation may certify the total mileage to the California State Controller in accordance with the provisions of California Streets and Highways Code section 2121. (No Fiscal Impact, Mandatory)
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BACKGROUND
The Public Works Department maintains 415.90 centerline miles of road with 408.35 miles of paved roads and 7.55 miles of unpaved roads in the unincorporated portions of Napa County. The county road system consists of 40.6 miles of arterial roads, 105.7 miles of collector roads, 6.2 miles of urban local, and 255.9 miles of local roads. The 2023-24 Pavement Management Program (PMP) Update states that the cost to reconstruct the county road system, given current deferred maintenance, is $823 million. To effectively maintain this significant asset with gas tax and sales tax revenue, the County uses the PMP to prioritize road maintenance, repair, and rehabilitation. Public Works staff will update the PMP in 2026.
The State Controller's Office distributes Highway Users Tax Account (gas tax) funds to the various agencies in the state based on a variety of formulas, in accordance with Streets and Highways Code sections 2100 to 2121. Factors used in calculating these apportionments include population, number of vehicle registrations, assessed value, assigned percentages, fixed sums per payment period and maintained mileage, which data is reported in the annual Road Fund Report submitted to the State Controller's Office by the Auditor Controller’s Office.
Streets and Highways Code section 2121 requires each county to annually submit any additions and exclusions to the mileage of maintained county roadways to the State Department of Transportation so that the State Department of Transportation can certify county mileage to the State Controller. The State Controller uses this data in proportioning the distribution of funds from the Highway Users Tax Account and SB 1 “Road Maintenance and Rehabilitation Program.”
For the County to be eligible to receive regional discretionary funds through the Metropolitan Transportation Commission (MTC) for road and safety projects, the County must certify a PMP and the number of miles of county-maintained roads. County staff verified that the county-maintained roads that are traversable by ordinary automobiles, have become county roads through due legal processes, are open to the general public, and are outside of incorporated cities. Additions typically come from the acceptance of new roadways or relinquishment of former State highways. Exclusions typically come from the annexation of roadways into incorporated cities or from abandonments. The 2023-2024 PMP Update consultant remeasured all county roads and adjusted some lengths. Since the Board adopted the 2023-2024 MPM Update, there have not been any changes to the 415.9 total centerline mileage of roadway maintained by the County.
Recommended action:
Adopt a Resolution submitting to the State Department of Transportation the total mileage of Napa County maintained roads as of April 2026 so that the State Department of Transportation may certify the total mileage to the California State Controller in accordance with the provisions of California Streets and Highways Code section 2121.
FISCAL IMPACT
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Is there a Fiscal Impact? |
No |
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Is it Mandatory or Discretionary? |
Mandatory |
Strategic Initiative: Build Healthy, Connected Communities
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: The proposed action is not a project as defined by California Code of Regulations, title 14, section 15378 (State CEQA Guidelines) and, therefore, CEQA is not applicable.