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.