The Rio Grandé Bridge at Radium Springs, erected in 1933, is one of the best surviving examples in the state of timber and beam bridge construction. Its superstructure consists of 19 spans, each 25 feet in length, and the roadway is 475 feet long. During the 1920s and 30s, timber beam bridges were an economical and easily maintained solution for crossing arroyos and waterways. Although it no longer carries motorized traffic, it continues to serve pedestrians, bicyclists and equestrians.