It looks like the Iowa DOT is considering widening I 35 to six lanes all the way North to Ames. It's probably already overdue to be honest.
http://www.desmoinesregister.com/st...interstate-35-dot-wants-your-input/100021540/
http://www.desmoinesregister.com/st...interstate-35-dot-wants-your-input/100021540/