St Helena Elm Tunnel Tree Maintenance


State Route 29 -St. Helena Elm Tunnel in Napa County

Motorists to expect delays due to tree maintenance starts at 9:00 AM Tuesday, February 22, 2022

(Flaggers will direct motorists during lane closures)


NAPA COUNTY- Caltrans will be implementing one-way traffic controls on State Route 29 (SR-29) just north of St. Helena within the Elm Tunnel.

Five consecutive days of work are scheduled daily starting at 9:00 AM until 5:00 PM on Tuesday, February 22, 2022 through Friday, February 25, 2022. Crews will be preforming regular tree maintenance including removing 11 elm trees which are infected with tree rot and Dutch Elm Disease that have become a safety concern.

For worker and public safety, crews will have one-way traffic control in place during the maintenance hours on State Route 29.

Motorists are advised to expect delays and exercise caution while driving in this area. All work is weather and conditions permitting.

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