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Donner Summit Bridge (Rainbow Bridge), Truckee, California
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The Donner Summit Bridge, also referred to as the Rainbow Bridge or Donner Memorial Bridge, is a concrete arch span built during the 1920s near Donner Summit. The bridge was part of historic US Route 40, the primary east-west highway for motorists traveling between San Francisco, CA and Atlantic City, NJ until Interstate 80 was constructed in 1964.
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