Brackett Field, Raging Waters, and Fairplex (formerly the Los Angeles County Fairgrounds) are all adjacent to Puddingstone Reservoir, which is inside Bonelli Regional Park.

In 1923, the County of Los Angeles Flood Control District purchased a large piece of land to construct a dam to hold back floodwaters from an area covering 30.3 square miles (78 km2).

In 1932, a road across the top of the dam was constructed, creating a more direct route between the Pacific Electric station in San Dimas and Pomona Blvd.

It was a considerably more direct route south - travelers previously had to either go west through Covina or east through Ganesha Park in Pomona.

[1][2] The California Office of Environmental Health Hazard Assessment has issued a safe eating advisory for any fish caught in the Puddingstone Reservoir due to elevated levels of mercury and PCBs.