The reservation has an area of 75 acres (300,000 m 2) – a remnant of the 86,400 acres (350 km 2) the tribe once owned. The tribe's reservation is the Dry Creek Rancheria, situated near the town of Geyserville in Sonoma County, California. The casino includes the Quail Run Restaurant, the Oak Bar, and Lounge 128. In 2002, the tribe established River Rock Casino on its reservation near Geyserville. The tribe's name was officially changed from 'Dry Creek Rancheria' to 'Dry Creek Rancheria Band of Pomo Indians'. The Articles were approved by the Secretary of the Interior on April 16, 1973. The tribe was reorganized via Articles of Association adopted on September 13, 1972. No one was ever forced to live on a rancheria. Adults were to be given assigned plots of land, but in actuality, most Indians simply moved onto the rancherias with no assignments.

Most of the land was selected and purchased by Special Indian Agent John Terrell, who took much care in finding good plots of land. rancheria program, which began in 1893 and ended around 1922, when 58 tracts of land were purchased in California on which 'homeless' Indians could live rent- and tax-free. The Dry Creek area, in what is now the Alexander Valley, was and still is prime agricultural land. In 1915, the federal government purchased and held in fee, land for the 'Dry Creek Rancheria', Dry Creek Valley being the name of the area, for use by both the 'Dry Creek' Indians and the Geyserville Indians. They were followed in the 19th century by American gold prospectors and settlers, who quickly outnumbered the native populations. Sustained European contact began with the Russian fur trappers in the 18th century. The Dry Creek Band are Southern Pomo, descended from the Mihilakawna and Makahmo bands. The Pomo people are indigenous to northern California and formed about 21 autonomous communities, speaking seven Pomoan languages. It has a reservation near Geyserville, California, in Sonoma County, where it operates the River Rock Casino Resort. The Dry Creek Rancheria Band of Pomo Indians is a federally recognized tribe of Pomo people, an indigenous people of California.

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