Napa Valley

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Napa Valley

Flood Control Projects

Napa Valley Wine Train Relocation

The $79M Napa Valley Wine Train (NVWT) heavy civil project was located in downtown Napa, CA. The project involved the excavation and embankment of on-site material as part of the Napa River Flood Control Project. Ultimately, the new channel allows the U.S. Army Core of Engineers (USACE to) divert the Napa River flow during storm events.

This was an extremely complex project requiring planning that involved SUU, USACE, and the Town of Napa as well.

The project required coordination of 53 subcontractors and many neighboring businesses.

The project required work ranging from 35,000 cubic yards of excavation in town to removing and replacing active train tracks along with three new railroad bridges.


  • Excavation
  • Track Bed Construction
  • Water Main Replacement
  • Sewer
  • Storm Drain
  • Grading Streets
  • Traffic Control
  • Project Management

The project encountered numerous challenges driven by the discovery of unknown conditions after city streets were excavated. Approximately 65% of the original plan sheets had to be redesigned prior to receiving approval by USACE. SUU effectively developed a new plan to reduce street closures from 22 weeks to 9 weeks and created plans to convert an originally designed bored culvert placement to a dig and lay multiple culvert system. This reduced cost, allowed for larger culvert capacity, and avoided installing two additional access points to the Napa Wine Train station.