Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ranney Bridge is a historic Pratt Pony Truss Bridge over the Ausable River at Keene Valley in Essex County, New York. It was built in 1902 and was built by the Canton Iron Bridge Company. It was originally located at the hamlet of New Russia and moved to its present site about 1925. It is 15 feet, 9 inches wide and spanning 59 feet, 9 inches at roughly 7 feet, 4 inches above water level. It was listed on the National Register of Historic Places in 1999. A truss bridge is a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to dynamic loads. Truss bridges are one of the oldest types of modern bridges. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by nineteenth and early twentieth century engineers. A truss bridge is economical to construct owing to its efficient use of materials.