The mile-long stretch of marijuana plants being cultivated on national forest land in northeastern Oregon carried an estimated street value of at least $136 million, state police Lieutenant Gregg Hastings told Reuters.
John Shaul, police sergeant for the town of La Grande, called the size of the marijuana farm "staggering."
The two-page indictment charges all six men, who were arrested on June 15, with one count each of conspiracy to manufacture more than 1,000 marijuana plants and one count of depredation of government property.
Investigators alerted to the site by the hunters also confiscated three firearms from the pot farm, which included tents and camping gear, food, water and other supplies, enough to sustain the growers for several weeks, state police said.
Wallowa County Sheriff Fred Steen told the Oregonian newspaper the six men were all Mexican nationals.
Each faces up to life in prison if convicted on the drug charges alone. The property damage charge carries a maximum 10-year sentence.