Mountain Quarries Railroad Bridge

Mountain Quarries Railroad Bridge

Just downstream from the confluence of the North and Middle Forks of the American River stands the Mountain Quarries Railroad Bridge. Constructed in 1912, it was at that time the longest concrete arch railroad bridge in the world. The bridge was designed by John Buck Leonard and built by the Donaldson & Harrelson Company for the Mountain Quarries Company and the Pacific Portland Cement Company, at a cost of $300,000. It was built to haul limestone from a nearby quarry to Auburn, located 7 miles away. The bridge was in use daily until the Mountain Quarries shut down in 1941. The following year, the railroad track along the entire line was removed for the war effort.

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James Wilson Marshall

James Wilson Marshall

Marshall and his men set out for the millsite that September. Their first task was to build a double cabin to house the millworkers and the Wimmers; Peter, Jennie (the camp cook), and their children. Another cabin was then built for Marshall. Some forty local Indians were hired to excavate the millrace and to build the diversion dam. The more skilled men set to felling trees and whipsawing them into timbers for the mill.

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