From 12 to 25 July 2009, National Park Service law enforcement joined 15 other agencies in Operation SOS (“Save Our Sierra”), organized by the Fresno County Sheriff’s Office, to clear marijuana grows in and around Kings Canyon National Park.[1] Northern parts of the park lie in Fresno County, and the operation focused on the Highway 180 corridor connecting its frontcountry areas.[1]

Officers eradicated over 400,000 marijuana plants from 71 illegal cultivation sites, most of them on public lands along Highway 180 between Grant Grove and Cedar Grove.[1][2] The sites were tied to Mexican drug trafficking organizations.[1][2]

Law enforcement made over 80 arrests, served five warrants, confiscated 32 weapons, and seized 46 pounds (about 20.9 kg) of processed marijuana, three vehicles and over $40,000 in cash.[1][2] National Park Service personnel carried out round-the-clock highway interdiction during the two weeks to disrupt trafficking supply lines in peak season; 29 NPS staff took part, including Yosemite rangers, special agents and a tactical team, and NPS officers made over 40 of the arrests.[1]

Park Superintendent Craig Axtell called the cultivation a major resource threat to the parks.[2] The Park Service noted that 900,000 plants seized over the previous two years carried an estimated street value of $3.6 billion, with no separate value published for this haul.[2]