Clarkson Construction Company was awarded three projects in Johnson County, Kansas on I-435 & U.S. 69 for $311 million. The work included widening, reconfiguring and reconstructing: I-435 from Metcalf on the east to Quivira Road on the west, U.S. 69 from 119th Street on the south to I-35 & 75th Street on the north. The construction included interchanges at: I-435 and Antioch, I-435 and U.S. 69, I-435 and Metcalf, U.S. 69 at 119th Street, U.S. 69 and College Boulevard, U.S. 69 and 103d Street, U.S. 69 and 95th Street, U.S. 69 and 87th Street and U.S. 69/I-35/75th Street. Numerous collector-distributor roads were also constructed as part of the work to facilitate safer ultimate traffic movements.
The work required included: 1,700,000 cubic yards of earth and rock excavation. Thirty-six bridges and two Conspan® structures were constructed, requiring 84,000 cubic yards of concrete, 10,400,000 pounds of reinforcing steel, 18,000,000 pounds of structural steel, and 3,600 lineal feet of precast concrete girders, retaining walls and noise walls were constructed totaling 425,000 square feet and 660,000 square feet, respectively. Work also included 92,000 lineal feet of storm drainage pipe, 820,000 square yards of lime or fly ash treated subgrade, 800,000 square yards of cement treated base, 820,000 square yards of concrete pavement, 194,000 lineal feet of permanent concrete barrier, 250,000 tons of asphalt pavement both temporary and permanent. The work also included: traffic control, 410,000 lineal feet of temporary concrete barrier was placed and relocated, 145,000 lineal feet of stone columns for subgrade improvement, signing, ITS, lighting, traffic signals, temporary and permanent striping, erosion control, riprap, fence, guardrail, and seeding.
All of the work was completed while maintaining 270,000 vehicles per day through the work zones.
Clarkson completed each of the projects on-time and earned early completion incentives where they were provided.