San Antonio Creek (Marin County, California)

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Coordinates: 38°9′30″N 122°32′39″W / 38.15833, -122.54417

San Antonio Creek
Arroyo de San Antonio
stream
Name origin: Spanish

Country	United States
State	California
Region	Marin and Sonoma counties


Source
- location	7 mi (11 km) southwest of Petaluma, California
- elevation	790 ft (241 m)
- coordinates	38°10′54″N 122°44′36″W / 38.18167, -122.74333 ^[1]
Mouth	Petaluma River
- location	west of Lakeville
- elevation	20 ft (6 m) ^[1]
- coordinates	38°9′30″N 122°32′39″W / 38.15833, -122.54417 ^[1]

Length	17.5 mi (28 km) ^[1]

San Antonio Creek is an eastward-flowing stream in the California counties of Marin and Sonoma that forms part of the boundary between those counties. It empties into the Petaluma River.

San Antonio Creek springs from Antonio Mountain in Marin County and runs north 2 mi (3.2 km) into Chileno Valley. Turning east-southeast, it begins to define the county line. It passes under Chileno Valley Road and Point Reyes-Petaluma Road, then parallels San Antonio Road eastward to U.S. 101. It crosses under U.S. 101 to its confluence with the Petaluma River near Hog Island in the wetlands south of Petaluma, California.

The U.S. 101 bridges are each two lanes wide and 120 ft (37 m) long. The northbound bridge was built in 1929 and reconstructed in 1979. The southbound bridge was built in 1947. There is also a bridge at San Antonio Road 0.6 mi (1.0 km) north of U.S. 101; built in 1917, it is a concrete tee beam 101 ft (31 m) long. Marshall Petaluma Road crosses the creek on a 25 ft (8 m) concrete tee beam built in 1929. Point Reyes Petaluma Road crosses on a 102 ft (31 m) concrete continuous slab built in 1964.^[2]