The I-71/I-670 interchange has been a main attraction for accidents over the years. All eyes will be on something else thanks to the first phase of the largest highway project in central Ohio history. Since the roadways in the belly of the interchange are located well below the groundwater table, a water field was installed to lower the groundwater table elevation during construction. Complete removal of two existing bridges, construction of a new two-span bridge and the completion of 125 ft of the first cut-and-cover tunnel in downtown Columbus was finished in 175 days.
