Frank G. Bonelli Regional Park is a man-made recreational area in San Dimas, California, United States, in Los Angeles County. It is near the Orange Freeway, the Foothill Freeway and the San Bernardino Freeway. It is named after former LA County Supervisor Frank G. Bonelli. The park contains a 250-acre lake called Puddingstone Reservoir, which provides a place for fishing, swimming, sailing, wind surfing, boating, and jet skiing, along with a waterfall.