Interstate 235 (Iowa) - Route Description

Route Description

Interstate 235 begins at the western intersection of Interstate 35 and Interstate 80, known locally as the West Mixmaster. Here, eastbound I-80 exits the highway, which becomes I-235 and joins northbound I-35. From the West Mixmaster, I-235 heads east. Almost immediately is a half-diamond interchange with 50th Street in West Des Moines. One mile (1.6 km) later is a partial-cloverleaf interchange with Valley West Drive, which was renamed from 35th Street in 1988 due to its proximity to Valley West Mall and Valley High School.

At Windsor Heights at a tight partial-cloverleaf interchange I-235 meets 73rd Street / 8th Street. The interchange is particularly tight because of an Iowa Interstate Railroad line just to the east. 73rd Street / 8th Street is actually a single road: north of I-235, 73rd Street follows the Des Moines street numbering plan, while south of I-235, 8th Street follows the older street numbering plan of West Des Moines.

At the 63rd Street interchange, I-235 picks up a fourth lane of eastbound travel and drops a lane westbound. Now within the city limits of Des Moines, it passes the through the heavily wooded Waterbury neighborhood. Near the 42nd Street interchange, I-235 curves to the south around Theodore Roosevelt High School. One half-mile (0.80 km) later is an interchange with 31st Street, which provides access to Drake University to the north, and to Terrace Hill, the governor's mansion, to the south.

East of 31st Street, I-235 briefly picks up a fifth lane and drops a lane westbound, creating a 10-lane freeway just west of downtown. This stretch of freeway receives, on average, over 125,000 vehicles per day, making it the busiest stretch of road in the state.

There are three eastbound interchanges connecting I-235 to downtown Des Moines. Martin Luther King Jr. Parkway and 19th Street, a pair of one-way streets, lead traffic to the west of downtown. Keosauqua Way, known locally as Keo Way, enters downtown from the northwest. These interchanges are combined westbound. Closer to the Des Moines River, a combined interchange in each direction filters off the rest of downtown traffic to two destinations: Seventh Street and Sixth Avenue, and Third Street and Second Avenue, each of which are pairs of one-way streets. The fourth lane of traffic drops off at this combined interchange.

At the Des Moines River, I-235 passes Wells Fargo Arena, the main Iowa Events Center destination, on the western shore and the Des Moines Botanical Center on the eastern shore. On the eastern side of Des Moines, it passes the East Village, the Iowa State Capitol, and East High School before the interchange with U.S. Route 69. One mile (1.6 km) east is an interchange with East University Avenue, which, up to now had been relatively parallel to I-235. East University provides access to the Iowa State Fairgrounds for northbound I-35 and eastbound I-80 traffic.

At University Avenue, I-235 begins curving to the north, dividing an industrial district to the west and residential areas to the east. 1+1⁄₂ miles (2.4 km) to the north, it intersects East Euclid Avenue at a partial-cloverleaf interchange. It continues north for another 1+1⁄₂ miles (2.4 km) until it meets Interstate 35 and Interstate 80 again at the East Mixmaster.