The Lyndon Bridge is a metal Parker Pratt through-truss bridge in the village of Lyndon, Whiteside County, Illinois, United States. The Lyndon Bridge was designed by engineer R.S. Riser and completed in 1894 for around $20,000. Whiteside County maintained the bridge from its construction until it was closed to all traffic in 1980. In 1995, as the county was about to demolish the bridge, a group of citizens worked together and saved it from demolition. The bridge was listed on the U.S. National Register of Historic Places in 2003.