Arroyo Las Positas is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map , accessed March 15, 2011 westward-flowing watercourse in Alameda County, California, which begins at the confluence of Arroyo Seco and Cayetano Creek north of Livermore, and empties into Arroyo Mocho in Dublin, California.
See also List of watercourses in the San Francisco Bay Area
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