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The highest combination road and rail bridge in the world, the Pit River bridge is also the highest rail bridge ever built in the United States. Constructed in 1942, the colossal cantilever bridge was a necessary component of the Southern Pacific railroad relocation from the construction of the 602 foot (183 mtr) high Shasta Dam. The creation of Lake Shasta resulted in a dozen new rail tunnels and 4 towering trestles.
One of the highest concrete dams in the United States, the 602 foot (183 mtr) high Shasta Dam was constructed just downstream of the confluence of the Sacramento and Pit rivers. Extensive surveys were made prior to the dam’s completion to find the most suitable spot for the rail line to cross the deep canyon of the Pit River. The abutments had to be founded on soil that was not prone to landslides once the steep slopes became saturated with water. A route that would have closely followed the nearby McCloud river was changed for just that reason. The final route required large bridges across several major creeks including O’Brien, Doney and Salt in addition to the two big river crossings of the Pit and Sacramento. (SOURCE: Highest Bridges.com




