 After flood waters receded and the damage was assessed , sections of I @-@ 680 were reopened to traffic . However , the section west of I @-@ 29 was the most heavily damaged and it remained closed . Contract bids were let on September 23 and reconstruction began on September 28 . Construction crews worked at " an accelerated pace " to complete the road in 34 days . The road was officially reopened on November 2 during a ceremony in Crescent hosted by Governor Terry Branstad . 
