Built in 1917, Rainbow Bridge in Folsom, CA is an outstanding example of a concrete arch bridge both for its span length and also for its unusually high level of aesthetic treatment. The arch ribs, arch columns, piers (especially those at the ends of the arch span) all have detailing designed to enhance the visual appearance of the bridge. In between the arch columns, concrete beams support the deck. The fascia beams between the columns were designed with an attractive arch shaped. This was not constructed as a utilitarian bridge, it was designed to be a signature bridge for Folsom. In 1969, the bridge was widened slightly. Additional deck beams appear to have been added to support the wider deck, but these beams were designed with the same arch shape as the original fascia beams, maintaining the original aesthetic appearance.