Clover Valley Lumber Company was headquartered in Loyalton in nearby Sierra Valley. In its prior life, it was the Marsh Lumber Company. In 1917, Clover Valley formed and it was typical mill/box factory operation. By 1955, Clover Valley had 54 miles of railroad line. Some of these spur lines still can be seen on the west flank of Thompson Peak. Noted, railroad historian, David Myrick stated it had the largest railroad logging operation in Plumas County. I beg to differ on that, as the Red River Lumber Company had an extensive railroad logging system in northern Plumas County. In 1957, Clover Valley sold, its new buyer began dismantling the railroad logging line in 1958—the last of its kind in this part of California. The Loyalton mill would later be acquired by Sierra Pacific Industries.