Castro Rocks

The rocks lie almost directly under the Richmond-San Rafael Bridge (I-580).

[1] The rocks are named after Don Víctor Castro, a local rancho-era land owner.

[citation needed] They are shown as "Castro Rocks" on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold.

[2] Castro Rocks are the home of many harbor seals,[3] which lie on them to rest and sunbathe.

[6] The seals at this location have high levels of toxic pollutants including the DDT, PCBs, PBDEs, PFOS, PFOA, and mercury.