From the plaque:
Site of Butterfield Stage
Station where mail was delivered, horses changed and passengers given rest and a meal.
First stage carrying overland mail left Tipton, Missouri
on September 15, 1858 and, passing through Temescal, arrived
in Los Angeles October 7, 1858.
First dedicated by the History and Landmarks Committee, Corona Woman's Improvement Club, May 24, 1934 at the site of the state station along Temescal Canyon Road. Rededicated Oct 7, 2006 by the Corona Woman's Improvement Club.