I have to tell you that Iowa hill definitely got our attention! That was a bugger! We were more than happy to get off that really steep section and onto the "normal" 16 mile climb that came afterwords. There was also a really steep section near the end, I forgot the name of the road but some lady on a single behind us couldn't pedal anymore and fell over! I'm sure that section was in the 15%+ range for about 1/2-3/4 mile.