Castro Rocks

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Castro Rocks with harbor seals Castro Rocks from the water.jpg
Castro Rocks with harbor seals

The 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]

Contents

Name

The Castro Rocks are named after Don Victor Castro, a Californio ranchero and politician. Don Victor Castro.jpg
The Castro Rocks are named after Don Víctor Castro, a Californio ranchero and politician.

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]

Harbor seals

Castro Rocks are the home of many harbor seals, [3] 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. [4] There are also sometimes sea lions on the rocks. [5] The rock's Harbor Seals also frequent Mowry Slough, Brooks Island, Yerba Buena Island, and Mare Island. [6]

The seals at this location have high levels of toxic pollutants including the DDT, PCBs, PBDEs, PFOS, PFOA, and mercury. [7]

Related Research Articles

Red Rock Island

Red Rock Island is an uninhabited, 5.8-acre (2.3 ha) island in the San Francisco Bay located just south of the Richmond–San Rafael Bridge. The property is the only privately owned island in San Francisco Bay. The boundaries of three counties – San Francisco, Marin, and Contra Costa – converge on the island. The San Francisco County portion is an incorporated part of the city of San Francisco since it is a consolidated city-county; the Contra Costa portion is incorporated inside the city limits of Richmond.

The Brothers (San Francisco Bay)

The Brothers are a pair of small islands, East Brother and West Brother, located in the San Rafael Bay embayment of San Pablo Bay, these roughly 1,000 feet (300 m) west of Point San Pablo in Contra Costa County, California.

The Sisters (California)

The Sisters are two small rock islands in San Pablo Bay, located 500 meters (1,600 ft) northeast of Point San Pedro in Marin County, California.

Browns Island (Contra Costa County)

Browns Island is a regional preserve of the East Bay Regional Park District (EBRPD) in Pittsburg, Contra Costa County, California, United States. It is an island in Suisun Bay, part of the Sacramento-San Joaquin River Delta, separated from Pittsburg by New York Slough.

Roe Island

Roe Island is an island in Suisun Bay at the mouth of the Sacramento-San Joaquin River Delta in Solano County, California, 10 km east of Benicia. Its western tip is named Preston Point, and its eastern tip is Gillespie Point. It is shown, labeled "Preston Island", on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold and an 1854 map of the area by Henry Lange.

Grand Island (California)

Grand Island is an island lying between Sycamore Slough and the Sacramento River. A post office operated at Grand Island from 1854 to 1919. It is shown, labeled "Taylor Island", on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold and an 1854 map of the area by Henry Lange.

Ryer Island (Suisun Bay)

Ryer Island is an island in Suisun Bay at the mouth of the Sacramento-San Joaquin River Delta in Solano County, California, eight miles east-northeast of Benicia. It is administered by Reclamation District 501, and is in the Suisun Resource Conservation District. At the time of statehood it was known as Kings Island, and is labeled as such on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold as well as an 1854 map of the area by Henry Lange.

Winter Island (California) Restored as a tidal marsh in Suisun Bay

Winter Island is a 453-acre (183 ha) island in Suisun Bay, in the western Sacramento-San Joaquin River Delta. It is north of Pittsburg, separated from Browns Island to the west by a slough. It was private property, and contained one house. It is used as a duck hunting area, a wetland, and a dredging disposal area. In 2016 Winter Island was purchased by the California Department of Water Resources in order to restore the island as a tidal marsh. Winter Island is part of Contra Costa County, and managed by Reclamation District 2122. It is shown, labeled "Ruckels Island", on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold and an 1854 map of the area by Henry Lange.

Joice Island Island in California

Joice Island is a small island in Grizzly Bay in the San Francisco Bay Area of California. It is part of Solano County, and partially administered by Reclamation District 2141. It is bordered on the east by Montezuma Slough, on the south by Morrow Island, on the west by Suisun Slough, and on the north by Cutoff Slough. Its coordinates are 38°09′00″N122°03′34″W. An unlabeled island, in the same approximate location as the southernmost part of Joice Island, is shown on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold and an 1854 map of the area by Henry Lange.

Hammond Island (California) Island in California

Hammond Island is a small island in Suisun Bay, California. It is part of Solano County. Its coordinates are 38°06′18″N121°56′15″W. An 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold shows islands partially covering some of the current area of Hammond Island, labeled "Davis Island" and "Warrington Island".

Chipps Island Island in California

Chipps Island is a small island in Suisun Bay, California. It is part of Solano County. It is also known as Knox Island, Its coordinates are 38°03′19″N121°54′43″W by which name it appears on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold, as well as an 1854 map of the area by Henry Lange,

Dutton Island Island in California

Dutton Island is a small island in Suisun Bay, California. It is part of Solano County, and included within Reclamation District 2127. Its coordinates are 38°04′54″N121°58′14″W. An 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold, as well as an 1854 map of the area by Henry Lange, shows an unlabeled island covering some of the area now occupied by Dutton Island.

Grizzly Island Island in California

Grizzly Island is a small island in Grizzly Bay in the San Francisco Bay Area of California. It is part of Solano County, partially managed by Reclamation Districts 2112, 2129 and 2136. Its coordinates are 38°09′05″N121°58′22″W. Islands that partially cover some of its current area, labelled "Warrington Island" and "Davis Island", are shown on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold and an 1854 map of the area by Henry Lange.

Simmons Island Island in California

Simmons Island is a small island in Grizzly Bay in the San Francisco Bay Area of California. It is part of Solano County, and included within Reclamation District 2127. Its coordinates are 38°05′49″N121°59′26″W. It is shown as "Simmons Island" on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold, and as "Simons Island" on an 1854 map of the area by Henry Lange.

Wheeler Island (California) Island in California

Wheeler Island is a small island in Suisun Bay, California. It is part of Solano County; parts of it are included in Reclamation Districts 2127 and 2130. Its coordinates are 38°05′06″N121°56′15″W. An 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold, and an 1854 map by Henry Lange, show islands partially covering some of the current area of Wheeler Island, labeled "Davis Island" and "Warrington Island".

Sutter Island Island in California

Sutter Island is a small island of the Sacramento River in California. It is bordered by the Sacramento River on the northeast, Steamboat Slough to the southease, and Sutter Slough to the west. It is located across the Sacramento River from Paintersville. It is part of Sacramento County, and managed by Reclamation District 349. Its coordinates are 38°17′37″N121°35′32″W. It is shown, labeled "Schoolcraft Island", on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold and an 1854 map of the area by Henry Lange.

West Island (California) Island in California

West Island is a small island in the San Joaquin River, California. It is part of Sacramento County. Its coordinates are 38°01′24″N121°46′43″W. It is shown, labeled "Webers Island", on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold and an 1854 map of the area by Henry Lange.

Kimball Island Island in California

Kimball Island is a small island in the Sacramento–San Joaquin River Delta. It is part of Sacramento County, California. Its coordinates are 38°01′38″N121°49′00″W, and the United States Geological Survey measured its elevation as 0 ft (0 m) in 1981.

Montezuma Island Island in California

Montezuma Island is an island in Suisun Bay, an embayment of San Francisco Bay, and downstream of the Sacramento–San Joaquin River Delta. It is part of Sacramento County, California, and not managed by any reclamation district. Its coordinates are 38°04′28″N121°50′23″W, and the United States Geological Survey measured its elevation as 7 ft (2.1 m) in 1981. It is labeled "Burnett Island" on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold, and shown (unlabeled) on an 1854 map of the area by Henry Lange.

Spinner Island Island in California

Spinner Island is an island in Suisun Bay, an embayment of San Francisco Bay, downstream of the Sacramento–San Joaquin River Delta. It is part of Solano County, California, and not managed by any reclamation district. Its coordinates are 38°04′11″N121°52′10″W, and the United States Geological Survey measured its elevation as 0 ft (0 m) in 1981. It is shown in an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold, as well as an 1854 map of the area by Henry Lange.

References

  1. Topographic map, TopoQuest, retrieved July 6, 2008
  2. Ringgold, Cadwalader; Stuart, Fred D.; Everett, Chas.; Harrison (1850). "General Chart embracing Surveys of the Farallones Entrance to the Bay of San Francisco, Bays of San Francisco and San Pablo, Straits of Carquines and Suisun Bay, and the Sacramento and San Joaquin Rivers, to the Cities of Sacramento and San Joaquin, California". David Rumsey Map Collection. San Francisco Common Council. Retrieved 25 February 2021.
  3. Tagging program Archived 2007-09-09 at the Wayback Machine , SFSU, retrieved August 1, 2007
  4. SFSU Archived 2007-09-06 at the Wayback Machine , Castro Rocks page, retrieved August 1, 2007
  5. NOAA Seeks Comments On A Proposed Reauthorization For California Department Of Transportation To Harass Seals During Bridge Reconstruction Archived 2008-02-12 at the Wayback Machine , NOAA Press Release, February 12, 1999, retrieved August 4, 2007
  6. vhfmapweb.jpg Archived September 11, 2007, at the Wayback Machine , Radio tagging map, San Francisco State University, February 2004, retrieved August 4, 2007
  7. 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

Coordinates: 37°55′58″N122°25′01″W / 37.932817°N 122.416963°W / 37.932817; -122.416963