He's been identified as 26-year-old Robert Monreal of Dos Palos.
The California Highway Patrol says the crash happened before 2:45 am Thursday on Russell Avenue near Althea Avenue, south of Dos Palos.
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Witnesses told officers they saw the car go into the canal and didn't see anyone get out.
A water rescue team arrived and pulled Monreal's body from inside the car.
He was pronounced dead at the scene.
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Officers are still investigating what led up to the crash.