After reading the answer to the Guessing Quiz from last week on the unusual truss bridge in Mississippi photographed by James Baughn, our next bridge in the Pic of the Week series paying tribute to Mr. Baughn takes us to Iowa and this bridge. The Black Bridge is a two-span truss bridge where the main span features a pin-connected Pratt through truss bridge with X-laced portal bracings, and the approach span is a Warren pony truss with alternating verticals where each panel has an A-frame shape. The connections are riveted. The total length of the structure is 250 feet, the main span has a length of 168 feet. Not much information is mentioned about the bridge except the fact that the structure was built in 1914, though it is likely that the spans were imported elsewhere because at that time, the pin-connected trusses were being phased out in favor of riveted connected trusses. It is likely that the through truss span is older than the date given, say between 1880 and 1895. The Warren span was probably built at this time, yet it may have been added when the bridge was rehabilitated in 1972. Evidence is needed to confirm one theory or another.
This portal view was photographed by Mr. Baughn in 2013, during his bridgehunting tour through Iowa. It was at that time there was the Historic Bridge Weekend which took place in the eastern half of Iowa plus Iowa and Boone. Apart from his home state of Missouri, Mr. Baughn’s favorite places to photograph also included Iowa and Kansas, where he spent a lot of time photographing the bridges there. Iowa was probably the second most popular destination with Kansas and Illinois on the state’s heels. One can see his photos in the bridgehunter.com website. While Iowa may be at the front in terms of deficient bridges, the number of historic bridges in the state still belongs to the top five of the highest number in the USA, together with Texas, Pennsylvania, Ohio, Indiana and Oregon. While some key structures in the state, like the Wagon Wheel Bridge near Boone, Shaw Bridge in Anamosa, the I-74 Suspension Bridges in the Quad Cities or the three historic bridges in Winneshiek County (Henry, North Bear Creek and Gilliecie) are no longer extant, the state still has a wide gallery of bridges spread out throughout the state, including Tama County, which still has 15 truss bridges in the area.
This bridge is located in Tama County spanning the Iowa River at 360th Street, two miles west of Chelsea at Duffus Landing. While the structure is closed to vehicular traffic, and has been since 2016, the bridge is still reachable and can be crossed by hikers and used as a fishing area. It is unlikely that it will be torn down because of its popularity in the area. Yet repairs may have to be made in the future to ensure that the structure can be used by all but cars.
In case you want to share more about this bridge, feel free to comment here or on the Chronicles‘ facebook page. Happy bridgehunting, folks!