[1] It is located on Poso Creek 5.5 miles (8.9 km) south-southeast of McFarland,[2] at an elevation of 427 feet (130 m).

This name conflicted with the community of Pozo along the Butterfield Overland Mail stagecoach route in San Luis Obispo County and officials in Washington renamed it Spottiswood.

[4] The route of an early irrigation project, the Pozo Canal, is visible from aerial photos of this area.

The eastward continuation of SR 46, Famoso Woody Road, leads into the Sierra Nevada foothills, passing through the Mount Poso Oil Field on the way.

The westward continuation leads to the city of Paso Robles, California in San Luis Obispo County.