The Old Iron Bridge, also referred to as Colorado River Bridge, is a 1285 ft-long bridge with three steel truss spans and concrete piers that crosses the Colorado River in Bastrop, Texas, United States. The bridge is one of the earliest surviving uses of the Parker truss in Texas.

History

With automobiles becoming the dominant form of transportation in the United States after World War I, a new bridge was needed to handle the increasing traffic between Houston and Austin. The original estimate of the cost of the Old Iron Bridge was $45,000 and was partially financed by bonds and local taxes. Bids on the project were solicited and the Kansas City Bridge Co. was selected as contractor. The final cost of the bridge's construction was $167,500. The bridge was completed in 1923 and opened for use in January 1924. The original bridge torn down in the early 1930s. The bridge was listed in the National Register of Historic Places on July 19, 1990.