traffic on June 22, 2012. The southbound span opened on August 19, 2015, making it the fourth extradosed bridge in the U.S. The second and third extradosed bridges in the U.S. are Interstate 35 frontage road spans over the Brazos River in Waco, Texas. Construction began in July 2012 and the bridges were dedicated in July 2014. They are the first extradosed bridges to be constructed in Texas. The fifth extradosed bridge in the United States is the St. Croix Crossing, which crosses the St. Croix River between Oak Park Heights, Minnesota and St. Joseph, Wisconsin. Construction began on the bridge in 2014 and it was opened to traffic on August 2, 2017. The bridge replaced the older Stillwater Bridge in downtown Stillwater, Minnesota, which was functionally obsolete and deteriorating from its age. References Bridges by structural type