Reiner Gae Poppenga, 61, (pictured) was also booked into Placer County Jail on suspicion of obstructing a public officer after he allegedly fought with deputies who tried to take him into custody.
Deputies went to Creekview Ranch Middle School in the unincorporated area of west Roseville about 3:45 p.m. Thursday where school officials reported that a man had walked onto campus and confronted the principal.
The man, later identified as Poppenga, allegedly pointed an object that he held like a handgun and threatened to kill the principal, according to a sheriff's department press release.
The principal directed staff to place the school in a lockdown. School had already ended for the day but there were children on campus participating in activities.
Poppenga, who is homeless, was found in a nearby creek bed. Deputies said he fought with them before he was taken into custody.