Quarry Lakes Regional Recreation Area, Regional recreation area in Fremont, California.

Quarry Lakes Regional Recreation Area is a park of former gravel pits between Centerville and Niles in Fremont, bounded northeast by BART tracks and south and west by Alameda Creek. Its lakes are former pits dug as deep as 120 feet below the surface. Horseshoe Lake has a swimming complex and a boating pier, Rainbow Lake holds warmwater fish, and Lago Los Osos and Willow Slough are for nature observation only.

The Niles Sand and Gravel Company worked a gravel plant on the south bank of Alameda Creek from 1912, and in 1954 it took over the operation of Black Point Aggregates in what is now the park. By 1969 pits reached 120 feet below the surface, and the company pumped five million gallons a day into Alameda Creek. A 1972 court ruling called that pumping an illegal waste of groundwater; the Alameda County Water District and the East Bay Regional Park District bought the land between 1975 and 1992 and began converting it to parkland in 1997.

The name reflects its industrial past as a quarry, yet today visitors experience it primarily as a place for swimming, fishing, and boating. The lakes have become a gathering spot where local families spend weekends and people escape from nearby urban areas.

The area is open during daytime hours with parking available at several entrance points, and the best time to visit is during warmer months when lakes and trails are most enjoyable. Paths around the lakes are relatively flat and beginner-friendly, so visitors of different fitness levels can explore the area comfortably.

The area simultaneously functions as a groundwater recharge basin for Alameda County Water District, meaning the lakes play an important role in local water management. This dual purpose as both a recreation site and water storage system is unknown to many visitors who see the lakes only as a leisure destination.