The school's "students are being evacuated and the path for children to evacuate has been cleared," authorities said.
Dulce Alavez vanished from a park in Bridgeton, New Jersey, on Sept. 16.
The man told police in Mt. Shasta that he had killed people at his apartment, more than 200 miles away, officials said.
A dozen additional women also accused the actor of either inappropriately touching them or kissing them, according to court documents released Tuesday. He was not charged in those cases.
Interim Chief Ed Kraus said he was "deeply sorry for what occurred."