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View of a sag pond area along the Hayward Fault in Arroyo Agua Caliente Park in southern Fremont.

Arroyo Agua Caliente Park is located in southern Fremont at the intersection of Paseo Padre Parkway and Parkmeadow Drive. The "hot water stream" no longer flows in the park, but it does have a natural sag pond area filled with cattails (visible behind the trees and to the right). The sag pond was formed by the active trace of the Hayward Fault. Nearby, the Spanish called Warm Springs Agua Caliente (hot water). Americans developed a health spa and resort that utilized the hot water until the springs stopped flowing after the 1868 earthquake, causing the resort and surrounding businesses to close down.

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