The Iowa DOT has released its final plan (officially, “preferred alternative”) to remove the existing US 65/IA 330/IA 117 intersection and build an interchange. Construction is scheduled for 2017 and 2018 despite a prominent eminent-domain fight that is also the final, bitter continuation of the opposition that nearly prevented the “Marshalltown diagonal” from being finished during the Great Depression.
The interchange plan (link to PDFs) remains mostly the same: It will be built northeast of the existing intersection, becoming the single junction for 65, 117, and F17 with the expressway. The roundabout that was going to be at the south end of the interchange with the realigned 117 and F17 (as quasi-frontage roads returning to each old routing) has been removed.