|Location||San Francisco Bay|
|Etymology||William A. Richardson|
|Primary inflows||Arroyo Corte Madera del Presidio, Coyote Creek|
|Average depth||20 ft (6.1 m)|
Richardson Bay (originally Richardson's Bay) is a shallow, ecologically rich arm of San Francisco Bay, managed under a Joint Powers Agency of four northern California cities. 911-acre (369 ha) Richardson Bay Sanctuary was acquired in the early 1960s by the National Audubon Society. The bay was named for William A. Richardson, early 19th century sea captain and builder in San Francisco. It contains both Strawberry Spit and Aramburu Island.The
In spite of its urbanized periphery, Richardson Bay supports extensive eelgrass areas and sizable undisturbed intertidal habitats. It is a feeding and resting area for a panoply of estuarine and pelagic birds, while its associated marshes and littoral zones support a variety of animal and plant life. Richardson Bay has been designated as an Important Bird Area (IBA), based upon its large number of annual bird visitors and residents, its sightings of California clapper rail and its strategic location on the Pacific Flyway. The bay's waters are subject to a "no discharge" rule to protect the elaborate and fragile ecosystems present, including a complex fishery, diverse mollusk populations and even marine mammals such as the harbor seal.
Owing to its lack of depth and complicated channel structure, Richardson Bay is limited in boating uses to kayaking and small sailing craft. There are extensive hiking and bicycling paths at the bay perimeter, especially in the shore areas of Mill Valley and the town of Tiburon.
On August 22, 1822, an English whaler, the Orion, put into Yerba Buena Cove in San Francisco for supplies; the captain was William Anthony Richardson, described as tall, fair haired, blue-eyed and young, was sighted by Maria Antonia, daughter of the Commandante of the Presidio of San Francisco, Ygnacio Martinez. Martinez, for whom the town of Martinez is named, decided to invite the Captain to reside with their family. Maria married the captain after he joined the Catholic Church, being baptized "Guillermo Antonio Richardson." This wedding, held at Mission Dolores on May 12, 1826 was the first great Spanish-Anglo Saxon wedding in North America.
Richardson taught carpentry, boat building and navigation at Mission Dolores, served as Captain of the Port of San Francisco, and built the first significant residence in San Francisco, although it was meant to be a trading post. He had charge of several schooners belonging to the Mission Dolores and Mission Santa Clara. Richardson received a 19,500-acre (79 km2) Mexican land grant in 1838, Rancho Saucelito, which is all of the land north of the Golden Gate extending from bay to ocean and ranging north to Mount Tamalpais The grant contained all the land southeast of Mount Tamalpais, and included Redwood Canyon and the lands now within Muir Woods National Monument. Richardson Bay was thus named in the honor of this energetic early settler and builder.
The Tiburon Peninsula on the northeast side of the bay was part of Rancho Corte Madera del Presidio granted to John Thomas Reed in 1834.
According to local sourcesand period maps, the Bay's original given name was possessive: Richardson's Bay. However, the United States Board on Geographic Names discourages the use of apostrophes in United States place names, which is why the name appears as Richardson Bay in government databases and maps.
Richardson Bay is developed on surficial sediments of clays, silts and minor sands and gravels deposited in a primarily marine and estuarine environment during periods of previous high stands of water relative to the present shoreline. The bay muds are widespread in San Francisco Bay and, at Richardson Bay, are approximately 80 to 95 feet (24 to 30 meters) deep .The Bay Muds are of Holocene Age (less than 10,000 years of age). They overlie firm alluvial soils which contain two sand layers at 92 and 110 feet (29 and 35 meters), respectively. This section, in turn, overlies shale of the Franciscan Complex, a heterogeneous mixture of sedimentary, igneous and metamorphic rock gathered together in the course of the tectonic evolution of the region from the Late Jurassic to the Middle Miocene. These assemblages of Franciscan rocks are referred to as tectonostratigraphic terrains and two of them, the Central Belt and the Coastal Belt, are in fault contact near Richardson Bay.
Richardson Bay is an important ecological area being managed by Audubon California as the Richardson Bay Audubon Center & Sanctuary.There are significant estuarine resources, marsh birdlife, mammalian species and marsh plants.
Birds are abundant in Richardson Bay, with over one million migratory visitors each winter, many of whom utilizing the upper mudflats and Bothin Marsh associated with the area west of the U.S. Route 101. In addition to being designated a high score IBA, Richardson's Bay has been dedicated as a Hemispheric Reserve of the Western Shorebird Network. Migrating birds that winter regularly at Richardson's Bay include least sandpiper, western sandpiper, spotted sandpiper, American avocet, dunlin, marbled godwit, greater yellowlegs, willet, long-billed curlew and dowitchers . A special resident of Bothin Marsh, Blackies' Creek mouth and DeSilva Island is the California clapper rail, a non-migratory endangered species.Beginning in 2014, endangered black oystercatchers have been observed nesting on Aramburu Island.
Common year around residents of the Richardson Bay Sanctuary include great blue heron, snowy egret, and great egret; mallard; red-tailed hawk and turkey vulture; killdeer and western gull; mourning dove and rock dove; Anna's hummingbird. Common residents Passeriformes include scrub jay, American crow, chestnut-backed chickadee, bushtit, Bewick's wren, house sparrow, red-winged blackbird, house finch, California towhee and song sparrow.
Fishery characteristics of Richardson Bay include a Pacific herring fishery and oyster beds. The herring fishing fleet serving all of San Francisco Bay is based in Richardson Bay at the Sausalito harbor. This herring fishing is overseen by the California Department of Fish and Game; the herring population is in a downward trend, although not from excessive fishing pressure with the net techniques in use, but rather from ocean environmental factors. Herring spend most of their lives in the open ocean and come to Richardson Bay and other estuaries for winter spawning in the shallow protected waters. In Richardson Bay their eggs attach to assorted surfaces such as eelgrass,piers or rip rap. After the eggs hatch, the herring larvae consume plankton; before hatching the eggs are subject to predation by gulls at low tide and sturgeon and other assorted estuarine fauna at higher tides.
Regarding the oyster beds, an experimental program is underway as of 2006, in which foreign oyster shells (biologically inert) are bagged and em-placed in underwater locations to serve as larval substrates, in order to assist the native oysters in propagating. Locally oysters are preyed upon by the bat ray and certain crabs.
The extensive mudflats of Richardson Bay provide a rich habitat for marine invertebrates. Many of the species are found elsewhere in San Francisco Bay. Characteristic organisms include burrowing clams, polychaete worms, decapod crustaceans, amphipods, phoronids and anemones. A field survey conducted on a broad mudflat along the Strawberry/Belvedere shoreline found species associated with rocks including: bivalves, ( Macoma balthica , Mya arenaria and Mytilus edulis ); the sea snail Littorina planaxis; the crab Hemigrapsis oregonensis ; the isopod Sphaeroma quoyanum ; the barnacles Balanus glandula and Balanus amphitrite ; the nemertean Lineus ruber ; and the anemones Diadumene leucolena and Haliplanella luciae .
Mammals visiting Richardson Bay include the harbor seal, which hauls out on DeSilva Island and on the Tiburon shore near the Richardson Bay Audubon Sanctuary headquarters. The endangered salt marsh harvest mouse is also thought to be present.
Flora include intertidal and upland species. Probably the most notable feature is the extensive eelgrass population at the tideland perimeter of Richardson Bay. This eelgrass occurrence in Richardson Bay is considered one of the most sizeable stands in Northern California, and it is being restored, leading to further extent of this habitat. There is an extensive pickleweed habitat at the western end of the bay, where many acres of mudflat areas are exposed to shorebirds at low tide at the efflux of Pickleweed Inlet. Upland plants found at the perimeter of Richardson's Bay include toyon, coast live oak, California bay, and native California bunch grasses.
On November 7, 2007, there was a large oil spill in the San Francisco Bay .This Cosco Busan oil spill was found to be lethal to herring fry in oiled versus non-oiled sites in Richardson Bay. This spill has greatly affected the organisms in the bay.
Through the latter 19th century and early 20th century, the land fronting on Richardson Bay was extensively subdivided into public and private ownership encompassing thousands of parcels. The cities of Tiburon, Mill Valley, Belvedere and Sausalito have enacted strong shoreline development policies to protect the perimeter of Richardson Bay, even though considerable development has occurred. The Audubon Society manages the whole Richardson Bay Sanctuary subject to governance by the Joint Powers Agency of the four peripheral cities.
One parcel deeded from Reed to Rosie Verall, who worked for the Reed family, is now the core of the Audubon Richardson Bay Sanctuary. Verall donated this land of approximately 13 acres (5.3 ha) to be held in permanent trust as a wildlife sanctuary. The Audubon Society purchased this upland parcel along with the entirety of the subtidal and intertidal lands of Richardson Bay in 1960. The Lyford House built in 1876 occupies the Verall parcel, even though the house was built at a different location in the vicinity known as Strawberry Point. The house is furnished in period style and is used by the National Audubon Society for special functions and events.
As of 2019, the bay contains about one hundred impoverished residents who live on abandoned boats one-quarter mile from the shore.
Richardson bay joins San Francisco Bay where the water depth becomes 20 feet (6 m), demarcated by a highly irregular boundary connecting the southern end of the Sausalito Marina] with the southern tip of Belvedere, sometimes called Peninsula Point. At this line of demarcation the depth increases rapidly on the San Francisco Bay side, becoming 100 feet (30 m) in depth almost immediately. This portion of San Francisco Bay, also known as Raccoon Strait, possesses highly turbulent waters. Boating in Richardson Bay is limited to small sailing craft and kayaks due to limited draft available, and nearly 900 acres of the bay is closed for six months during the winter each year to provide protection for the ecological system, particularly migratory waterbirds.
Richardson Bay receives inflow from numerous seasonal small unnamed streams and three major streams: Arroyo Corte Madera del Presidio which receives the surface runoff from the steep southeast slopes of Mount Tamalpais; Pickleweed Inlet; and Coyote Creek (Marin County), which receives the runoff from the slopes to the west of Richardson Bay. These streams empty into Richardson Bay from the northwest. Arroyo Corte Madera del Presidio and Coyote Creek are intermittent in flow.
The National Audubon Society operates a nature center in Tiburon that offers adult and children's nature programs, including summer camp, school science programs, birthday and family events, lectures, guided walks, environmental education workshops, Bay Shore Studies docent programs and volunteer projects. Recent efforts included renovation of the human-made islands Aramburu,Pickleweed, and Unnamed to enhance their value as bird refuges.
Marin County is located in the northwestern part of the San Francisco Bay Area of the U.S. state of California. As of the 2010 census, the population was 252,409. Its county seat is San Rafael. Marin County is across the Golden Gate Bridge from San Francisco, and is included in the San Francisco–Oakland–Berkeley, CA Metropolitan Statistical Area.
Mill Valley is a city in Marin County, California, United States, located about 14 miles (23 km) north of San Francisco via the Golden Gate Bridge and 52 miles from Napa Valley. The population was 13,903 at the 2010 census.
Sausalito is a city in Marin County, California, located 8 miles (13 km) south-southeast of San Rafael, and 4 miles (7 km) north of San Francisco.
Tiburon is an incorporated town in Marin County, California. It is located on the Tiburon Peninsula, which reaches south into the San Francisco Bay. The smaller city of Belvedere occupies the south-west part of the peninsula and is contiguous with Tiburon. Tiburon is bordered by Corte Madera to the north and Mill Valley to the west, but is otherwise mostly surrounded by the Bay. Besides Belvedere and Tiburon, much of the peninsula is unincorporated, including portions of the north side and the communities of Strawberry and Paradise Cay.
William Richardson was an early California entrepreneur, influential in the development of Yerba Buena, the forerunner of San Francisco.
Ridgway's rail is a near-threatened species of bird. It is found principally in California's San Francisco Bay to southern Baja California. A member of the rail family, Rallidae, it is a chicken-sized bird that rarely flies.
Bay mud consists of thick deposits of soft, unconsolidated silty clay, which is saturated with water; these soil layers are situated at the bottom of certain estuaries, which are normally in temperate regions that have experienced cyclical glacial cycles. Example locations are Cape Cod Bay, Chongming Dongtan Reserve in Shanghai, China, Banc d'Arguinpreserve in Mauritania, The Bristol Channel in the United Kingdom, Mandø Island in the Wadden Sea in Denmark, Florida Bay, San Francisco Bay, Bay of Fundy, Casco Bay, Penobscot Bay, and Morro Bay. Bay mud manifests low shear strength, high compressibility and low permeability, making it hazardous to build upon in seismically active regions like the San Francisco Bay Area.
The Tamalpais Union High School District or TUHSD provides high school education to students residing in ten elementary districts in central and southern Marin County, California and parts of West Marin. The headquarters are on the property of Redwood High School in Larkspur, California.
Arroyo Corte Madera del Presidio is a 4.1-mile-long (6.6 km) year-round stream in southern Marin County, California, United States. This watercourse is also known as Corte Madera Creek, although the actual stream of that name flows into San Francisco Bay further north at Point San Quentin. This watercourse has a catchment basin of about 8 square miles (21 km2) and drains the south-eastern slopes of Mount Tamalpais and much of the area in and around the town of Mill Valley; this stream discharges to Richardson Bay.
Seal Slough is a narrow winding tidal channel through a tidal marsh in San Mateo and Foster City, California. This slough has been the object of a wetland restoration project in recent years to enhance habitat value. Dredging has been carried out in Seal Slough since at least 1954. When the original sewage treatment plant for the city of San Mateo was constructed in 1935, its discharge was directed to Seal Slough.
Elkhorn Slough is a 7-mile-long (11 km) tidal slough and estuary on Monterey Bay in Monterey County, California. It is California's second largest estuary and the United States' first estuarine sanctuary. The community of Moss Landing and the Moss Landing Power Plant are located at the mouth of the slough on the bay.
The Lyford House is a Victorian house located in Tiburon, California. Built in 1876, the house is listed on the National Register of Historic Places.
Tamalpais Valley is an unincorporated community in Marin County, California.
Rancho Saucelito was a 19,752-acre (79.93 km2) Mexican land grant in present-day Marin County, California, given in 1838 by Governor Juan Alvarado to William A. Richardson. The name means "ranch of the little willow grove". The grant extended from the Pacific Ocean on the west, to Mount Tamalpais to the north, and the Arroyo Corte Madera del Presidio and Richardson Bay on the east; and included present-day Muir Beach, Stinson Beach, Sausalito, Tamalpais Valley, and Homestead Valley.
Coyote Creek is a stream in the Richardson Bay watershed, draining Tamalpais-Homestead Valley, California eastward into Richardson Bay, Marin County, California, United States. The stream originates on Coyote Ridge and flows 2.5 miles (4.0 km) to the bay at the south end of Bothin Marsh.
Corte Madera Creek is a short stream which flows southeast for 4.5 miles (7.2 km) in Marin County, California. Corte Madera Creek is formed by the confluence of San Anselmo Creek and Ross Creek in Ross and entering a tidal marsh at Kentfield before connecting to San Francisco Bay near Corte Madera.
The black-necked stilt is a locally abundant shorebird of American wetlands and coastlines. It is found from the coastal areas of California through much of the interior western United States and along the Gulf of Mexico as far east as Florida, then south through Central America and the Caribbean to Ecuador and the Galápagos Islands. The northernmost populations, particularly those from inland, are migratory, wintering from the extreme south of the United States to southern Mexico, rarely as far south as Costa Rica; on the Baja California peninsula it is only found regularly in winter.
Larkspur Creek is a short stream which flows 3.5 miles east to meet Corte Madera Creek in Larkspur, California just before reaching Richardson's Bay. The creek was named for the town of Larkspur, which was named by Georgiana Wright, a Briton and spouse of the 1887 developer of the area. She named the town of Larkspur for lupine flowers on the hills that she mistook for larkspur.
The Kendall-Frost Mission Bay Marsh Reserve is a 20-acre University of California Natural Reserve System reserve on the northern shore of Mission Bay in San Diego County, California. Administered by UC San Diego, the site is owned by the University of California and managed for teaching and research.
Aramburu Island (ah-ram-boo-ru) is a 17-acre (6.9 ha) island in Richardson Bay, Marin County, California. It, along with Strawberry Spit, came to exist in the 1950s and 1960s as a consequence of dumping dredged material from nearby developments into the bay. In the 1980s, the northern part of the landmass was cut off from Strawberry Spit on the directions of a Marin County supervisor to prevent housing from being constructed there, creating Aramburu Island. While natural erosion processes caused it to shrink slowly over the course of subsequent decades, a 2010s restoration effort added large amounts of material to prevent further erosion, and turned it into "sustainable bird habitat".
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