The San Antonio River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data
The National Map
accessed March 15, 2011

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

in southern

Monterey County, California Monterey County ( ), officially the County of Monterey, is a county located on the Pacific coast in the U.S. state of California. As of the 2020 census, its population was 439,035. The county's largest city and county seat is Salinas. Monte ...

. The river was used as an irrigation source for

Mission San Antonio de Padua Mission San Antonio de Padua is a Spanish mission established by the Franciscan order in present-day Monterey County, California, near the present-day town of Jolon. Founded on July 14, 1771, it was the third mission founded in Alta California ...

Geography

The river travels southeast from its

headwater The headwaters of a river or stream is the farthest place in that river or stream from its estuary or downstream confluence with another river, as measured along the course of the river. It is also known as a river's source. Definition The ...

s in the

Santa Lucia Range The Santa Lucia Mountains (sæntə luˈsiːə) or Santa Lucia Range is a rugged mountain range in coastal central California, running from Carmel southeast for to the Cuyama River in San Luis Obispo County. The range is never more than from t ...

in the

Los Padres National Forest Los Padres National Forest is a United States national forest in Southern California, southern and central California. Administered by the United States Forest Service, Los Padres includes most of the mountainous land along the California coast ...

and into

Lake San Antonio Lake San Antonio is a lake located primarily in southern Monterey County, California, and partially in northern San Luis Obispo County, California. The lake is formed by San Antonio Dam on the San Antonio River. The dam is 202 feet (62 m) tal ...

. This is a

reservoir A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including contro ...

behind the

San Antonio Dam San Antonio Dam (National ID CA00813) is an earthen dam on the San Antonio River in Monterey County, California in the United States. The dam impounds Lake San Antonio, a reservoir with a capacity of , located west of Camp Roberts. History San ...

, an earth-fill

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, a ...

on the river that forms the largest lake in the county. Downstream from the dam, the river travels east until it joins the Salinas River. The

Nacimiento River , name_etymology = , image = Nacimiento_River_1.jpg , image_caption = The river downstream of Nacimiento Dam , image_size = 300 , map = Salinas River watershed.png , map_size = 300 , ...

, which feeds Lake Nacimiento and is also a Salinas River tributary, parallels the San Antonio River's path several miles to the southwest.

Ecology

After depletion by 19th century fur trappers, California golden beaver (''Castor canadensis subauratus'') have expanded their range from the San Antonio River below the reservoir to the Salinas River mainstem.

References

{{Coord, 35.85982, -120.803656, type:landmark_region:US-CA, display=title Rivers of Monterey County, California Salinas River (California) Santa Lucia Range Monterey Ranger District, Los Padres National Forest Rivers of Northern California