Its source is in Corral Canyon, north of Mount Boardman in San Joaquin County. It then flows north 1.89 miles where it turns to flow west-northwest into Alameda County and Corral Hollow, then turns abruptly east in the vicinity of Tesla to flow east, into San Joaquin County again, and another 2.5 miles to where it turns again in a northeasterly direction for to the Delta-Mendota Canal, south of Tracy, California, in the San Joaquin Valley.
