(Arroyo Seco River, 268', 1943) across Arroyo Seco River SW of Greenfield, Monterey County, CA. Elm Av. (CR G16) SW 5.5 miles from jct with El Camino Real in Greenfield to the bridge. (N36 16.837 W121 19.358) Photo by Mark Comstock 5-7-09.