He was last seen at a party at a campground in the early hours of Saturday.
Rodni's disappearance is being treated as a possible abduction by the sheriff's office.
The public is being asked to help locate Rodni.
The 16-year-old girl was last seen at a party in the early hours of Saturday.
According to a press release from the Placer County Sheriff's Office, Rodni was last seen at a party involving about 100 "juveniles" and young adults near the Prosser Family Campground.
Rodni's car, a silver Honda CRV with the California license plate "8YUR 127," is missing and police are investigating her disappearance as a possible abduction.
Rodni was going to spend the night at the campground after most of the party, according to the friend who was with him.
She was not in the right mindset to drive. She wouldn't have made it far if she had driven. I'm concerned that someone might have offered to drive her home, but didn't.
The Placer County Sheriff's Office posted a video of Rodni's mother making a plea to the public for help finding her daughter.
We want her to stay in our house. "We're so scared, and we miss her so much, and we love her so much," Lindsey Rodni- Nieman said in the video.
Insider did not get an update on the case from the Placer County Sheriff's Office.
Rodni is a white woman with blonde hair and hazel eyes. The sheriff's office said she has many piercings and jewelry. She wore green pants and a tank top.
The sheriff's office wants to hear from anyone with information on Rodni's location. Secret Witness can accept anonymous tips at their website or via text.
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