Klondike Bridge
The Klondike Bridge is a road bridge spanning the Big Sioux River between Iowa and South Dakota, located southwest of Larchwood. It measures about 260 feet long and 14 feet wide, with a main span using Pratt through truss design and two smaller Warren pony truss approach sections supported by concrete piers.
A bridge was first built in 1901 but proved too small for growing traffic. In 1913, Lyon County commissioned a replacement, which Western Bridge and Construction Company of Omaha completed in 1914 using steel from Pittsburgh and incorporating a mix of standard and custom engineering practices.
Named after the nearby settlement of Klondike, the bridge connects Iowa and South Dakota and became a key reference point in the rural landscape. The structure reflects how communities relied on such infrastructure to stay connected, and locals recognized its importance in their daily movement across the river.
The bridge was closed to vehicle traffic in 2013 when a modern crossing was built nearby, but the historic structure remains visible from the roadside. Visitors can view the steel framework and construction details from outside to understand early bridge engineering methods.
The structure was built during a transitional period when bridge engineering standards were being unified across states. Its blend of custom and standardized components makes it a rare example of how early 20th-century engineering practices were evolving.
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