I-10 Mixed Flow Lane Addition/Widening

I-10 Mixed Flow Lane Addition/Widening alleviates congestion, enhances transportation efficiency, reduces commute times, and enhances safety of this crucial east/west urban corridor connecting Los Angeles County, San Bernardino County, and points farther east. Rapid growth in San Bernardino County has increased the number of daily commuters and added pressure on an already heavily used section of the freeway.

The mixed-flow lane project entailed the expansion of 2.5 miles of the existing I-10 freeway, stretching from Ford Street to Orange Street in Redlands, CA. The project's scope included widening the median lanes and bridges to introduce an additional 12-foot lane, an 18-foot median shoulder, and a median barrier in both directions. This encompassed widening 11 pairs of freeway median overpasses, totaling 10,900 cubic yards of structural concrete. The project also involved extensive mass grading, the construction of over 6,500 linear feet of bridge cast-in-drilled-hole (CIDH) pilings ranging from 1.5 to 4 feet in diameter, and the paving of 17,500 cubic yards of Portland Cement Concrete Pavement (PCCP). Additionally, the project addressed comprehensive drainage systems, utility installations, and retaining walls.

External lane enhancements included the construction of 2.7 miles, equivalent to over 17,900 square yards, of masonry sound walls. Furthermore, the project comprised the creation of 1,200 cubic yards of structural concrete for retaining walls and the installation of 30,700 linear feet of concrete barrier. Crews retrofitted existing bridges and shoulders, integrated bridge lighting, implemented ramp metering systems, and improved landscaping features.

Atkinson self-performed the structures, PCCP paving, utility installation, earthwork, and traffic control scopes of work. The affected areas of I-10 remained operational throughout the construction process.