Southern Iowa I-35 enters Iowa at the
Missouri state line near the town of
Lamoni. An interchange that provides access to the adjacent
US 69 and East 100th Street is situated over the state border. The highway travels to the north-northeast for until it again meets US 69 on the eastern edge of Lamoni. North of Lamoni is a rest area which overlooks the
Grand River and provides pedestrian access to Decatur County's Slip Bluff County Park. North of the Grand River, the Interstate straightens to a north–south alignment. Near
Decatur City, it intersects
Iowa 2 at a diamond interchange. Continuing north, the Interstate slightly eases to the east. Two rural interchanges, for County Road J20 (CR J20) and CR H45/Elk Street, and another in
Van Wert for CR J14/East Line Street dot the separating Decatur City and
Osceola. The next exit for CR H33/Kansas Street serves a casino and western Osceola. Northwest of Osceola is the western end of
Iowa 152, which connects I-35 and US 69 at a narrow point between the two routes. Further north, the small towns of
New Virginia,
Truro, and
St. Charles are each served by an interchange. The
Iowa 92 exit just east of
Bevington connects I-35 to the larger communities of
Winterset and
Indianola, to the west and east, respectively. The interchange for
Cumming is the last before the Interstate enters the
Des Moines metropolitan area. The first rest areas along Iowa's Interstates were built in the 1960s. They were modest facilities; separate buildings housed the restrooms and vending machines. A few rest stops had another building with local tourist information. The newer facilities feature one large building housing as many as 28 more toilets than the older buildings, in addition to all the other common rest area amenities. They also feature artwork by local Iowa artists. Each new rest area is designed around a theme. For instance, the facility near Story City celebrates the history of transportation in the state. Story County is the home of Iowa DOT and the location where the historic
Lincoln Highway and I-35 intersect.
Transit Jefferson Lines provides intercity bus service along the length of I-35 in Iowa serving seven communities along the route. The
Des Moines Bus Station serves as a major transfer point along the I-35 route. ==History==