I-229 Corridor?-?Sioux Falls, S.D.
Using a best-value selection process, the South Dakota Department of Transportation (SDDOT) chose a Kiewit-led team to construct its first highway design-build project and the single largest project ever undertaken by the state. To accelerate the project schedule and provide the least amount of public disruption, a 15-month fast-track construction window was established.
The $32.4 million, 6.9-mile renovation of the Interstate 229 loop involved removing existing pavement; repaving a total of 353,000 square yards of continually reinforced 10.5-inch concrete pavement; adding 12-foot-wide auxiliary lanes within the project limits; reconstructing existing interchange ramps; replacing mainline and interchange ramp surfaces; expanding and improving drainage; installing signage and lighting; and providing seeding and other landscaping.
An additional project component located at the north end of the corridor involved the reconstruction of two 435-foot by 78-foot bridges over the Big Sioux River. The existing four-span steel girder bridges were replaced with precast concrete girder bridges to increase capacity.
Despite one of the harshest winters in Sioux Falls' history and numerous weather delays, the project reached substantial completion on August 19, 2001 — 31 days ahead of SDDOT's original schedule.