The driver's cab was submerged in the pool and he needed to be rescued by emergency responders.
"I wasn't aware that the driver was injured or how badly," Turner said Wednesday afternoon through a team spokesman. "But I'm obviously grateful that the first responders were able to rescue him and I hope and pray he'll be fine."
Authorities say the truck's driver lost control on a hairpin curve and wound up down a hill and submerged in the pool.
While one rescuer kept the driver's head out of the water, others used the jaws of life to remove the steering column, which had pinned the driver inside the cab. A Portland Fire & Rescue spokeswoman told the Oregonian that at least eight people participated in the rescue.
The driver, who was not identified, had serious injuries and was taken to Oregon Health and Science University Medical Center for treatment.
The Associated Press contributed to this report.