Mountain House or Willow Springs Station, in what is now Kern County, California, was a stage station of the Butterfield Overland Mail, located 12 miles (19 km) south of Fountain Spring Station, and 15 miles (24 km) northeast of Posey Creek Station at Willow Springs on Willow Springs Creek.
On October 13, 1957, the California State Park Commission erected marker number 589 one and a half miles (2.4 km) south of it.
[2][3] Mountain House Station California Historical Landmark, signed May 22, 1957, reads: NO.
Operating through present Kern County during 1858-1861, this famous line ran from St. Louis, Missouri to San Francisco until the outbreak of the Civil War.
[4]35°41′31″N 118°55′03″W / 35.69186°N 118.91759°W / 35.69186; -118.91759 Source: "List of Butterfield Overland Mail Stations "Itinerary of the Route"" (PDF).