As summer vacation is approaching, we would like to take you to a man-made lake and this unique duo crossing, located in Taney County, Missouri. The Shadow Rock Bridge spans Swan Creek at the site where US 160 once crossed near the town of Forsyth. The crossing features two different bridges, located next to each other but having different types and even heights. The lower bridge features an open-spandrel deck arch with concrete deck cantilever approach spans. That span was built in 1932 by M.E. Gillioz and replaced the first crossing, a two-span Pratt through truss bridge with A-frame portal bracings. The higher bridge succeeded the arch span 20 years later. The two-span Parker through truss bridge with riveted connections and WV portal bracings was built by Porter and DeWitt in 1952. Both bridges are still being used to this day, with the arch bridge serving as direct access to Shadow Rock Park and statue. The truss spans carries through traffic but is in need of new paint and some rehab work, though the picture taken by Mr. Baughn doesn’t show the rust but the silver coloring.
Duo bridges of this kind are rare to find these as they are either being replaced with modern structures or removed in their entirety. This was noticeable with a bridge couple in Floyd County, Iowa at Nora Springs. We had a two-span arch bridge at First Street that was built in 1916 and a taller Viaduct at Congress Street built only 300 feet away in 1955. It was a pleasant site to see them side-by-side during my visit there in 1998. Sadly both are gone now- the viaduct was replaced in 2008, the arch bridge was removed in December last year.
But aside from the Shadow Rock Bridges where two bridges are side-by-side and at least 65 years old, which other examples do you know? Feel free to comment. Who knows, it might give bridgehunters a chance to visit them this summer, especially as we’re slowly but surely returning to normal after a year in standstill because of the Corona epidemic and chaos caused by…… You know who I’m referring to, right? 😉
Happy Bridgehunting, folks! 🙂