A 41-year-old Vallejo man died in a solo vehicle crash on state Highway 37 near Mare Island early this morning, the California Highway Patrol said.
The victim was driving a 2011 Nissan Versa west on Highway 37 west of the Mare Island exit when the Nissan drifted off the road, down an embankment and into the marsh, the CHP said.
The driver was found near the shoreline and was pronounced dead at the scene, the CHP said.
A witness saw debris in a lane and a single tail light in the water north of the road, the CHP said.
The CHP arrived at 2:15 a.m. and found the vehicle fully submerged upside-down in the water.
The crash is still under investigation.
The Solano County coroner's office has not released the man's identity.