Puddingstone Reservoir is a man-made lake located in San Dimas, California. It was created in the 1920s to provide water for the surrounding communities and is part of the San Gabriel Valley Water Company system. The reservoir covers approximately 250 acres and has a capacity of around 5,000 acre-feet of water. The area around Puddingstone Reservoir is popular for recreational activities, including fishing, boating, and hiking. It is situated within Frank G. Bonelli Regional Park, which offers picnic areas, trails, and scenic views. The reservoir is a vital resource for local wildlife and serves as a habitat for various species.