Judith Rock

Judith Rock is a large submerged rock about 1.3 kilometers southwest of Tyler Bight on the southwest side of San Miguel Island. A small top stair-steps down to depth through crevices, ledges, and short valleys cut into the structure, with the dive working from about fifty feet at the top to over one hundred at the base. The rock holds dense kelp, large fish, and the abundant invertebrate cover characteristic of a no-take reserve. Current over the structure is often strong, and the position out from the most exposed island in the park keeps the site weather-dependent.

The dive is advanced. Depth, current, and the exposure of San Miguel itself combine to make Judith Rock a site for experienced divers on settled days only. San Miguel has an island-wide three-hundred-yard shore-distance rule, with anchoring allowed only at Tyler Bight and Cuyler Harbor. The National Park Service also keeps boats three hundred yards off the Point Bennett pinniped rookery west of the rock, and Judith Rock sits east of that closure.

The stair-stepped top and the drop through crevices, ledges, and short valleys to a base past 100 feet put Judith Rock in the pinnacles biome. Giant kelp anchored on the rock and growing up through the water column to the surface makes it a kelp forest biome. Its position out from the most exposed island in the park leaves open water on the seaward side, a pelagic biome past the edge of the structure.

Access is boat only. Charter dive boats run to San Miguel from Santa Barbara as multi-day trips, with day trips from Ventura uncommon because of the distance.

Fishing and spearfishing are not legal here. All take inside the Judith Rock State Marine Reserve, established in January 2012, has been prohibited since the designation, and the site is open only to diving and observation.