Estero de San Antonio

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Estero de San Antonio[1]
San Antonio Creek
Estero de San Antonio in 2008
Name origin: Spanish Saint Anthony's Estuary
Country United States
State California
Region Marin and Sonoma counties
 - left Stemple Creek
 - location 1.5 mi (2.4 km) southwest of Bloomfield, California
 - elevation 400 ft (122 m)
 - coordinates 38°18′11″N 122°52′37″W / 38.30306°N 122.87694°W / 38.30306; -122.87694 [1]
Mouth Bodega Bay
 - elevation 0 ft (0 m)
 - coordinates 38°16′12″N 122°58′46″W / 38.27000°N 122.97944°W / 38.27000; -122.97944Coordinates: 38°16′12″N 122°58′46″W / 38.27000°N 122.97944°W / 38.27000; -122.97944 [1]
Length 9.5 mi (15 km) [1]
Basin 50 sq mi (129 km2) [2]

Estero de San Antonio is a stream in the northern California counties of Marin and Sonoma which empties into Bodega Bay.


The Estero springs just north of the Marin-Sonoma county line (from a hill overlooking Bloomfield, California) and runs south along Gericke Road into Marin County. Just north of Fallon-Two Rock Road, it turns west, flowing under the road just east of State Route 1. It flows south along the highway for 0.25 mi (0.4 km), then crosses under the highway at milepost 47.6 and continues west to a confluence with Stemple Creek 0.3 mi (0.5 km) southeast of Fallon, California. From there, it winds its way westward, passing under Middle Road and Valley Ford Franklin School Road before emptying into Bodega Bay 1.5 mi (2.4 km) north of Dillon Beach, California.


The Estero de San Antonio has a variety of habitat types, including freshwater ponds, mudflats, eelgrass and saltgrass area, and wooded ravines. It is estimated that the Estero has 923 acres (374 ha) of associated wetlands.[3]

In the summer or early fall, a sandbar often forms at the mouth of the Estero, damming it until the winter rains arrive. Area residents used to blast the sandbar to dispel high salt concentrations in the Estero.[2]


The United States Geological Survey's Geographic Names Information System cites ten variant names for this stream, including Stemple Creek (the name of its main tributary), Estero De Americano (almost identical to the parallel estuary 2 mi (3 km) north), Arroyo de San Antonio (also applied to Walker Creek, a parallel estuary 5 mi (8 km) south), and San Antonio Creek (the name of a creek further east along the county line).[1] In particular, the Estero's watershed is often referred to as the Stemple Creek watershed.[4] The stream is also referred to as Fallon Creek.[5]


The Estero de San Antonio is crossed by three concrete continuous slab bridges:

  • The Valley Ford Franklin School Road bridge, built in 1964, is 242 ft (74 m) long.
  • The Middle Road bridge, built in 1958, is 196 ft (60 m) long.
  • The State Route 1 bridge, built in 2001, is 62 ft (19 m) long.

It is also crossed at Fallon-Two Rock Road by a 22 ft (7 m) concrete tee beam bridge built in 1932.[5]

See also[edit]


  1. ^ a b c d e U.S. Geological Survey Geographic Names Information System: Estero de San Antonio
  2. ^ a b "Marin County Watershed Management Plan Administrative Draft" (PDF). Archived from the original (PDF) on July 24, 2011. Retrieved 2008-03-03. 
  3. ^ "Estero de San Antonio - Mouth of the Stemple Creek Watershed". Archived from the original on 2007-06-15. Retrieved 2007-12-10. 
  4. ^ "The Stemple Creek Watershed Project". Archived from the original on 2007-12-04. Retrieved 2007-12-10. 
  5. ^ a b "National Bridge Inventory Database". Archived from the original on 2013-10-31.