National Park Service rangers joined the Marin County Sheriff’s Office, the U.S. Park Police and other agencies in entering several marijuana grow sites in the Olema Valley and Bolinas Ridge areas of Point Reyes National Seashore on 29 August 2006.[1] They confiscated approximately 20,000 plants, which officials valued at about $50 million, in what the park service called one of the largest marijuana operations ever found in Marin County.[1][2]

The San Francisco Chronicle counted 22,740 plants across six terraced sites between Stinson Beach and the Randall Trail south of Olema, about half on Marin Municipal Water District land discovered during a routine aerial search.[2] Growers had cleared vegetation, terraced hillsides, run miles of irrigation hose from streams and spread hundreds of pounds of fertilizer and pesticides.[2] Park officials warned of damage to habitat for the spotted owl, steelhead trout and coho salmon, with cleanup expected to take months.[2][3] A Coast Guard helicopter flew low over the Olema Valley for days lifting netted plants out, after a smaller 2,500-plant site had been cleared in July.[1][3] No arrests were reported at the time.[2]