The Smolen–Gulf Bridge carries State Road (Ashtabula County Road 25) across the Ashtabula River at the Plymouth and Ashtabula Township line in northern Ashtabula County, Ohio. It is the longest covered bridge in the United States and the fourth longest covered bridge in the world. The bridge was dedicated August 26. 2008. The bridge is 613ft. long and stand 93 ft. above the Ashtabula River. With clear width of 30ft. and height of 14ft 6 in. it will support full legal load traffic and has a life expectancy of 100 years.