A passing driver spotted the body of a man about 11:20 p.m. Saturday along Arroyo Boulevard, Pasadena police Lt. Jason Clawson said.
A car believed to belong to the dead man was found parked up on the bridge.
A homeless man then discovered another body, described as that of a woman, about 6 a.m. Sunday in high brush below the western side of the bridge, according to Clawson.
No witnesses have reported seeing either person fall, Clawson said.
Foul play was not suspected in either incident.