Interstate 235 (I-235) in Iowa is an auxiliary Interstate Highway that runs just north of downtown Des Moines through the heart of the Des Moines metropolitan area. I-235 runs from the junction of Interstate 35 and Interstate 80 in West Des Moines to the separation of the same two interstates in Ankeny. The highway is approximately 14 miles (23 km) long. I-235, which had seen little improvement since its construction in the 1960s, was completely rebuilt and widened in a project that spanned most of the 2000s. Prior to the reconstruction, I-235 had two lanes in each direction with a third lane near downtown; the entire route now has at least three lanes of traffic in each direction, with an additional one or two lanes closer to the heart of the city.
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