HSIP Cycle 11 Silverado Trail Intersection Improvements/HSIPL-5921(090)
2 Documents in Project
Summary
SCH Number
2025121203
Lead Agency
Napa County
Document Title
HSIP Cycle 11 Silverado Trail Intersection Improvements/HSIPL-5921(090)
Document Type
NOD - Notice of Determination
Received
Posted
4/21/2026
Document Description
Napa County was awarded the Highway Safety Improvement Program (HSIP) Cycle 11 grant to improve critical intersections on Silverado Trail. The Proposed Project involves safety improvements at two intersections including the installation of flashing beacons, a right-turn lane, and other improvements. The following intersections do not comply with current safety standards and need upgrades and/or installation of warning signage to improve overall visibility.
At Silverado Trail with Oak Knoll Avenue, the proposed improvements include the installation of flashing beacons on either end of the intersection on Silverado Trail, a new streetlight, widening the apron of the Oak Knoll Avenue intersection with Silverado Trail and installing a right-turn lane on eastbound Oak Knoll Avenue, restriping the median on Silverado Trail north of the intersection to extend the median closer to the intersection, and widening Silverado Trail on the southbound lane towards Oak Knoll Avenue to provide a right-turn lane.
At Silverado Trail with Zinfandel Lane, the proposed improvements include the installation of flashing beacons on either end of the intersection on Silverado Trail and a new streetlight.
Contact Information
Name
Sydney Barclay
Agency Name
County of Napa
Job Title
Associate Engineer
Contact Types
Lead/Public Agency
Phone
Location
Coordinates
Cities
Napa, St. Helena
Counties
Napa
Regions
Countywide
Cross Streets
Zinfandel Lane, Oak Knoll Avenue
Zip
94574
Parcel #
N/A
State Highways
SR 121, SR 29, SR 128
Railways
Napa Valley
Airports
N/A
Schools
Willow, McPherson, St. Helena
Waterways
Napa River
Notice of Determination
Approving Agency
County of Napa
Approving Agency Role
Lead Agency
Approved On
County Clerk
Napa
Final Environmental Document Available at
https://www.napacounty.gov/3775/HSIP-Cycle-11-Silverado-Trail-Intersecti
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
No
Attachments
Notice of Determination
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