The Ventura County Sheriff's Office revealed on Sunday that they were also searching the surrounding areas of the lakes including cabins as well as in it.
The office wrote on Twitter: "In today's search for Naya Rivera, cabins and outbuildings in the surrounding area will be checked once again, as well as the shoreline. This has been part of the ongoing search effort since her disappearance on Wednesday afternoon. Boat crews continue to scan the lake."
And Ventura County Sheriff Sergeant Kevin Donoghue admitted there is "no way to really say" what happened, and said her body "may never come back up".
He explained: "If the body is entangled on something beneath the water, it may never come back up. There's no way to really say.
"We're putting our best foot forward to try and locate her, we're using all the assets that are available to us including technology like sonar ... We're relying on their expertise to help us in that endeavour. We're going to do everything that we can to find her."
The Ventura Co. Sheriff's department also tweeted their advice to those "intent" on searching for Rivera.
"For those intent on searching for Naya Rivera on your own, 1. The lake is closed. 2. Temps are already in the 90's. 3. The terrain around the lake is very steep and rugged. Our teams are well equipped and highly trained. We don't want to have to rescue you."