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From Wikipedia, the free encyclopedia

Castro Rocks are several rocks in Richmond, California protruding from the waters in San Francisco Bay between Castro Point and Red Rock Island.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]

Castro Rocks are the home of many harbor seals,[2] which lie on them to rest and sunbathe. The rocks are the largest harbor seal rookery in the northern San Francisco Bay and the second largest in the Bay Area itself.[3] There are also sometimes sea lions on the rocks.[4] The rock's Harbor Seals also frequent Mowry Slough, Brooks Island, Yerba Buena Island, and Mare Island.[5]

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


  1. ^ Topographic map, TopoQuest, retrieved July 6, 2008
  2. ^ Tagging program Archived 2007-09-09 at the Wayback Machine, SFSU, retrieved August 1, 2007
  3. ^ SFSU Archived 2007-09-06 at the Wayback Machine, Castro Rocks page, retrieved August 1, 2007
  4. ^ NOAA Seeks Comments On A Proposed Reauthorization For California Department Of Transportation To Harass Seals During Bridge Reconstruction, NOAA Press Release, February 12, 1999, retrieved August 4, 2007
  5. ^ vhfmapweb.jpg Archived September 11, 2007, at the Wayback Machine, Radio tagging map, San Francisco State University, February 2004, retrieved August 4, 2007
  6. ^ Harbor seals may help determine effect on humans of eating toxic fish, by Jane Kay, San Francisco Chronicle, 19-10-2009, access date 19-02-2009

External links

Coordinates: 37°55′58″N 122°25′01″W / 37.932817°N 122.416963°W / 37.932817; -122.416963

This page was last edited on 22 May 2017, at 10:21
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