This is a little late, but hey, so was the completion date of the project!
The flyover ramp from northbound I-35 to westbound US 30 in Ames opened two days before the Iowa State-Iowa game, alleviating one long-standing traffic headache for Des Moines metro travelers going to Ames.
This becomes the fourth interchange in Iowa where one of the ramps in a cloverleaf interchange — is a flyover instead of an inner loop. In the other cases, all exiting traffic leaves the mainline at the same time, then splits shortly thereafter.
- Eastbound I-80 takes a flyover as it joins northbound I-35 in West Des Moines. The straight line, into I-235, is properly marked as a left “exit”.
- Southbound I-380 takes a flyover as it joins eastbound US 20 in Waterloo, again keeping the interstate mainline off a loop.
- Southbound I-380 to eastbound US 30 in Cedar Rapids also includes a sub-ramp to Bowling Street.
There are quite a few pure cloverleafs left in Iowa, though, most notably I-80/I-380 which is being turned into a turbine interchange. Others are at US 30/61 in De Witt, I-29/I-680 near Crescent, I-35/US 20 near Williams, and I-80/US 61 in Davenport. US 20/75 on the east end of Sioux City was planned as a pure cloverleaf, but when the US 75 bypass was finally built the interchange became a six-ramp one instead. US 65/69 is pretty much one, but the ramp from southbound 65/westbound IA 5 to northbound 69 has a really hard right turn that isn’t really free-flowing.