LA GRANDE, Ore. -- Oregon State Police say they have uncovered what they believe is the largest outdoor marijuana growing operation in state history. LA GRANDE, Ore. -- Oregon State Police say they have uncovered what they believe is the largest outdoor marijuana growing operation in state history.

A group of bear hunters came upon the marijuana this spring and reported it to local police. On Wednesday, a state police SWAT team and an Oregon Army National Guard air team raided the site, located in a remote section of Wallowa County in northeast Oregon.

More than 91,000 plants, ranging in size from starter plants to 10 inches, were removed or destroyed by police over a two-day period.

La Grande Police Sgt. John Shaul describes the marijuana growing operation as "staggering," and says it encompassed a more than one-mile stretch in a ravine. There were also miles of plastic irrigation tubing found.