The crash occurred about 12:40 a.m. near East Imperial Highway and San Pedro Street, the Los Angeles Police Department reported.
Isaac Ambriz. 18, of Riverside, died at the scene, the Los Angeles County coroner's office reported.
According to authorities, Ambriz was westbound on Imperial Highway when his motorcycle crashed into a railroad crossing gate. His passenger, a woman about 19 years old, was taken to a hospital with critical injuries.