The quickest way to share the story of the Kate Shelley High Bridge and how it got its name is from the Wikipedia entry:
The Kate Shelley High Bridge, officially called the Boone Viaduct when it was completed in 1901, is one of the highest and longest double-track railroad bridges in the United States. It is located approximately 3 miles (4.8 km) west of Boone, Iowa.
It was nicknamed after the Iowa railroad heroine, Catherine Carroll Shelley, better known as Kate Shelley. On July 6, 1881, when she was 15 years old, Kate Shelley risked her life to warn the Chicago and Northwestern Railroad company that the Honey Creek bridge was out. A “pusher” train had fallen through the bridge near her home. Kate heard the accident and knew the train schedules, so Kate attempted to save a passenger train scheduled to travel over the Honey Creek bridge by crossing the Des Moines River Bridge near her Moingona home. It was night, during a raging thunderstorm. Wearing only her nightdress and armed with a lantern, she crossed the bridge on her hands and knees. She made it to the station and saved the train. She then led rescuers back to save the men who had fallen from Honey Creek Bridge. Of the four men who fell, two were saved, one was found dead, and the fourth was never found, presumed to be dead. In some versions of the tale, Kate was 17 years old, asserting that the birthdate on her own gravestone is inaccurate. They also claim the passenger train had already stopped, but no actual evidence has been presented proving either of those two disputed facts. Her bravery was heralded in many newspapers. Kate’s lantern is housed at the Boone County Historical Society Museum in Boone, IA.
This attraction is also listed on the Roadside America web page and the Roadside America app. This app and web site is “your online guide to offbeat tourist attractions”.