Construction Update - June 25, 2026

In this issue

  • Dupont Drive Intersection Work Nearing Completion
  • Sewer Work to Continue South Toward Merit Drive
  • Coming Up: Water Line Installation
  • Project Overview
  • Construction Notes

Underground Sewer Work Underway at the Dupont Drive Intersection

[updated!] Crews have completed installation of the underground sewer main at the Dupont Drive and Calistoga Road intersection. The detour directing motorists entering and exiting Dupont Drive east to St. Francis Road is expected to remain in place for another day or two as crews finish work in the area. The traffic signal at the intersection will remain in flashing red mode through Friday, June 26. When approaching a flashing red signal, treat it as a four-way stop. Come to a complete stop, yield to vehicles and pedestrians already in the intersection, and proceed when it is safe to do so.

Motorists using the detour are reminded to observe posted speed limits while traveling through the surrounding residential streets.

Sewer Work to Continue South Toward Merit Drive

[new!] With intersection work wrapping up at Dupont Drive, crews will be moving south along the east side of Calistoga Road to continue installing the new underground sewer line toward Marit Drive. This work is expected to be completed by the end of next week.

Traffic control measures will be in place while this work is underway. Please follow all posted construction signage and directions from flaggers on-site.

Schedules are subject to change due to weather and other unforeseen circumstances

Coming Up: Water Line Installation to Begin

[new!] Following completion of the new sewer line, crews will begin installing the new water line along the east side of Calistoga Road. Work is planned to start north of Dupont Drive and progress southward. When crews approach the Dupont Drive intersection, additional work will take place at that location, more details will be provided in upcoming newsletters as that work draws near.

Installing a new maintenance hole on Dupont Drive

Preparing a trench before installing the new sewer main

Project Overview

The Calistoga Road Pavement Rehabilitation & Utility Improvement project will repair and restore approximately 1.1 miles of Calistoga Road using Full Depth Reclamation and mill and fill paving techniques to address worn and deteriorating road conditions.

Improvements will also include adding buffered and protected bike lanes in select locations while maintaining existing bike lanes elsewhere, improvements to bus stop infrastructure, and pedestrian curb ramps upgraded to current ADA standards.

In addition to roadway improvements, the project includes  water and sewer system upgrades, including approximately 7,629 linear feet of water pipe replacement and 1,825 linear feet of sewer pipe replacement.

Construction Notes

As with all large construction projects, there will be unavoidable disruptions to nearby neighbors and to motorists traveling in the area – we apologize in advance for noise, dust, lane closures, traffic delays, and any other impacts or inconveniences. When driving, cycling, or walking in the area, always be aware of construction crews and equipment, flaggers, special signage, slower traffic, and changing roadway conditions. Use an alternate route if possible, and allow for additional time to get to and from your destination.

Typical working hours are 7:00 a.m to 5:30 p.m. During those hours traffic control measures and lane closures may be in effect.

Night work (8:00 p.m. to 5:00 a.m.) and weekend work may occur with advance notice.

For information about the Calistoga Road Pavement Rehabilitation & Utility Improvement Project and to ensure you are getting up-to-date project information, visit the project website at www.CalistogaRoadProject.com. Please share this information with your neighbors.

If you have questions or concerns about this project, send an email to [email protected] or call the project information line at (707) 387-4031.

Thank you for your patience and cooperation!