He was arrested in Branchburg early Monday by officers responding to a report of a suspicious person.
Forrest says Woodson was wearing a bulletproof vest and carrying a semiautomatic Bushmaster rifle under his jacket when he was arrested. The weapons and maps were found in a later search of his motel room.
Woodson was being held at the Somerset County Jail on charges including unlawful possession of weapons.
The prosecutor's office did not know whether Woodson had a lawyer.