On June 30 the Iowa DOT held another meeting about converting the US 30/218 intersection in southern Benton County into an interchange. It won’t be finished until 2019.
The interchange has ramps in the northwest and southeast quadrants to avoid both Youngville Station and a cemetery. The existing roadbed will be shifted southward starting just east of Youngville, so the westbound lanes will gradually shift south of the existing ones until they’re about where the eastbound lanes would be if the two-lane stayed in place.
Along with the interchange plan (PDF), we also got a timeline for completion of four-laning 30 from that location to Tama (PDF). There are four stages: Tama to IA 21, the IA 21 exit, 21 to 218, and the 218 exit. The whole thing is scheduled to wrap up in 2024.
(Totally unrelated FYI: The Forgotten Iowa Tumblr blog has made it to Benton County.)