Rock Quarry

Rock Quarry is a shore-adjacent boat dive site at Catalina Island, California, named for the historic quarry beside it that supplied rock for the breakwalls around San Pedro and Los Angeles Harbor. Large breakwall-type rocks run the length of the site, sloping steeply down through thick kelp to a sandy bottom, with depths ranging from 20 feet to 120 feet (roughly 6 m to 37 m).

The rocky shelves just below the surface give way to kelp forests, and the sandy flats provide resting habitat for horn sharks. The main point of interest is the scythe butterflyfish, typically found at around 25 feet (7.5 m). Other residents include Garibaldi, sea stars, schools of perch, kelp bass, sheepshead, and sea lions.

The site is considered suitable for beginners and is used for training dives, offering a calm, confidence-building environment for practicing skills in the shallower sections while still providing depth for more experienced divers.