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This marker is located Located at 3430 Duroc Road, Shingle Springs, California. The GPS coordinates for this location are N 38° 39.190 W 120° 57.800.
A list of Pony Express Waymarks that I have visited can be found here. You can log your visit to this landmark at waymark.com.
The "Duroc House" was only 175 feet due south from this monument on the road from Sacramento to Placerville. Starting on April 3, 1860 the Pony Express used this route between San Francisco and St. Joseph, Missouri. The stations used by the westbound Pony Express were Sportsman's Hall, El Dorado (via Placerville & Diamond Springs) and Mormon Tavern.
The U.S. Post Office, due to the Civil War, took over the prior private operation of the Pony Express and on July 1, 1861 made Placerville the western terminus of their Pony Express. To continue to San Francisco, Wells Fargo & Co. operated their own Pony Express via Folsom from Placerville and then used the railroad to Sacramento.
The "Duroc House" became the new Pony Express station from Placerville to Folsom.