CARLSBAD, Calif. -- A drunken driver crashed into a Carlsbad lagoon Wednesday, and a 27-year-old passenger found floating face down was fighting for her life, authorities said.

A 1996 Toyota Tacoma driven by 22-year-old Alicia Biggs of San Diego veered off northbound Interstate 5 near Tamarack Avenue in a crash reported shortly after 2 a.m., CHP Officer Eric Newbury said.

Amy Lopez was found floating face down in the lagoon, and Carlsbad police pulled her to shore and started cardiopulmonary resuscitation, Newbury said.

Biggs swam to shore, Newbury said, describing her injuries as moderate.

Both women were taken to Tri-City Medical Center, where Newbury said Lopez, also of San Diego, was listed in critical condition.

Biggs is suspected of drunken driving and will be charged with felony driving under the influence whenr she is released from the hospital, Newbury said.