The Centennial Bridge is a through arch bridge road bridge over the Missouri River connecting Leavenworth, Kansas and Platte County, Missouri. Constructed in 1955, it was initially a toll bridge. The bridge opened in 1955, a year after Leavenworth celebrated its centennial as the first city incorporated in Kansas. It is a two-span arch bridge connecting K-92 and Missouri Route 92. Its main span is 419.8 feet with a total length of 2,571.2 feet. During the construction a spur of Route 45 called the "Leavenworth cutoff" was built to speed traffic to Kansas City, Missouri. The two-mile spur, even though it is in Missouri was maintained by the city of Leavenworth until the tolls were removed from the Centennial Bridge in May 1977. This is now maintained by MODOT.