The Orin Allen Youth Rehabilitation Facility was established by the Contra Costa County Board of Supervisors, under the direction of the County Probation Officer, as a treatment center for adolescent delinquent youngsters. The first unit of The Ranch, which had a capacity of 21 wards, opened in March 1960.

The newest dormitory was added in 1999 bringing the total capacity to 100 residents. Residents are limited to male youth who have been committed by the Juvenile Court. This program serves to improve treatment at the local level rather than at the state level.