Fountain Creek Bridge is a limestone arch bridge which crosses Fountain Creek near Waterloo in Monroe County, Illinois, USA. The bridge was constructed in 1849 and served as a road bridge until the 1920s, when Illinois Route 156 opened on a new bridge. During the nineteenth century, stone arch bridges were commonly built in regions with stone quarries, such as Monroe County; roughly 100 stone bridges were built in the county. The Fountain Creek Bridge is the largest remaining stone arch bridge in the county and the second-largest which was only used by road traffic in the state.