Las Positas Valley Ride is a 17.4 mile moderately trafficked loop trail located near Livermore, CA and is rated as difficult. The trail is primarily used for road biking and is accessible year-round. 17.4 miles 656 feet Loop road biking Expand Map Sign up now to see this map! DescriptionFacilitiesRoad Cycling in Livermore Reviews (0)Photos (0)Recordings (2)No one has reviewed this trail yet. Be the first!