Traffic Update: S. Twin Oaks Valley Road reopens to through traffic; lane closures remain in place

After a water main break on Thursday, July 19 forced full lane closures along, S. Twin Oaks Valley Road, lanes reopened to through traffic on Friday, July 20; however, motorists can expect continued northbound lane closures along S. Twin Oaks Valley Road between Barham Drive and Campus Marketplace. In addition to the lane closures, southbound left turn lanes at Campus Marketplace remain closed.

According to Vallecitos Water District, the water main break was caused by a corroded pipe; however, the cause of the corrosion is still under investigation.

Crews are currently working to repair the water main and are expected to begin restoring the roadway throughout the evening of Friday, July 20.

Asphalt restoration is expected to begin Saturday, July 21 from 4 am to 5 pm. As work progresses, northbound lane closures will shift and a single southbound lane closure will be in place.  The far left northbound lane of S. Twin Oaks Valley Road and the southbound turn lane at Campus Marketplace will remain closed while crews complete necessary median restoration.

Standard traffic control measures with advanced warning signs and pedestrian detours will be in place. Traffic delays are anticipated and motorists are encouraged to drive with caution, follow all traffic control and use alternate routes if possible.

All water main and roadway repairs are expected to be completed by 4 pm on Sunday, July 22 with all S. Twin Oaks Valley Road lanes reopening by 5 pm of the same day. Delays in work schedule may occur.

For more information about the main break, contact Vallecitos Water District at (760) 744-0460 or

For more information about traffic control in place, contact the San Marcos Public Works Inspection Division at (760) 410-4433. For the latest lane closure information, visit

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