The Gordon Drive Viaduct in Sioux City, whose original structure is 83 years old, has been on lists of bridges most in need of replacement in Iowa. The Iowa DOT is starting work on its replacement.
These stories from KTIV and KMEG cover the meeting last week, where the DOT said it wants to have a proposal in the next year. Construction wouldn’t begin until the middle of the next decade at the earliest. (On the plus side, I-29 will be done by then! After that, the only project set for the area is that the US 20 Morningside Drive exit is supposed to have bridges over an abandoned railroad line taken out in 2023.)