A 20-year-old man was allegedly driving drunk and high on marijuana when his vehicle rolled over on a Northwest Travis County Road, seriously injuring himself and his passenger.

According to an arrest affidavit, the crash happened just after midnight on April 22, 2017, on RM-2769 and Abbotsberry Drive, approximately 5.9 miles away from Lake Travis.

At the scene of the collision, a witness told police that he found a car on its roof on the southeast side of RM-2769. The witness said the driver of the car, identified as Michael Hawley, 20, was unconscious. Hawley's passenger was awake, and the witness attempted to keep him calm while waiting for help, the affidavit said.

While investigating the crash scene, police said they discovered Hawley's car was traveling westbound on RM-2769 when it struck a guardrail, resulting in the vehicle sliding approximately 50-70 feet along the side of it, and eventually, off the roadway. At one point, the car struck a tree stump and flopped onto its roof, striking additional trees in the process.

Police said they found numerous bottles and cans of alcohol at the crash site, and the area was wet and smelled like liquor.

Police spoke with the passenger of the crash at the hospital, who suffered a collapse of both lungs, injuries to both kidneys, a spleen injury, fractured spine and multiple pelvic fractures, according to the arrest affidavit. He identified the driver as Hawley and said that they were on their way to Hawley's boat before they crashed. The passenger said he and Hawley were drinking alcohol before they got in the car, and Hawley had also smoked marijuana too.

Investigators subpoenaed for Hawley and the passengers' medical records and found that Hawley's blood alcohol concentration was .101 at 12:45 a.m. and his urine tested positive for Benzodiazapines, a class of psychoactive drugs, and THC, a psychoactive element of cannabis.

Hawley is accused of intoxication assault -- a third-degree felony that carries a prison sentence of two to 10 years. As of 11:30 a.m. Wednesday, Feb. 14, Travis County Jail records do not show Hawley in custody.