The driver had his two children with him when his truck went into the water just before 5:30 p.m. Sunday on Brooks Street, Sugar Land police said.
Photos from the scene show the truck almost fully submerged in the water.
Fortunately, police said all three of them were able to escape unharmed.
Investigators said the driver did not show any signs of intoxication.
It was unclear exactly what happened that caused the driver to lose control of the truck in the first place. The investigation is ongoing.