Figured this would make for a good place to link this topic over since it covers a road bridge on Excelsior Avenue in Kings County California and the abandoned Riverdale Branch Railroad bridge next to it on the Kings River:
https://surewhynotnow.blogspot.com/2017/07/riverdale-branch-railroad-ruins.html
The Riverdale Branch was a short lived railroad that only lasted about four decades. The only easily observed trace of the railroad is the bridge over the Kings River, I detailed the history of the line on the link.