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Highways, Roads & Interchanges

Flatiron is one of the largest highway constructors in the U.S. and plays an integral role in keeping traffic moving along our nation’s freeways. Learn more about our capabiliteis in our Bridges, Highways and Roads brochure.

We have successfully completed or are in the process of constructing the following major highways and interchanges:

Carolina Bays Parkway

Carolina Bays Parkway - Myrtle Beach, SC

The contract to build the new Carolina Bays Parkway included design, right-of-way acquisition, utility relocation and construction of a new limited access highway. This 34-month project was completed eight months ahead of schedule. The new roadway is named SC-31 and runs northwest…


Eastern Transportation Corridor

Eastern Transportation Corridor - Orange County, CA

Delivered via the design-build method, Flatiron completed this $803 million 25.4-mile limited-access toll road below budget and over one full year ahead of schedule. The four-to-six-lane road winds through mountainous, environmentally sensitive terrain as well as urban areas…


Glenwood Canyon Corridor

Glenwood Canyon Corridor - Garfield & Eagle Counties, CO

Flatiron received national recognition for the construction of a series of projects in the Glenwood Canyon corridor of I-70. All of these projects were built under conditions of stringent environmental requirements, strict traffic disruption restrictions, harsh winters,…


Highway 65 Lincoln Bypass

Highway 65 Lincoln Bypass - Lincoln, CA

Flatiron, with joint venture partner DeSilva Gates Construction, constructed the $137 million Route 65 Lincoln Bypass project, a two-lane highway between Sheridan and Lincoln, Calif., about 30 miles north of Sacramento. The project includes construction of 12 miles…


I-15 Managed Lanes

I-15 Managed Lanes - San Diego, CA

Flatiron is responsible for the construction of eight managed lanes contracts, totaling approximately $420 million, which comprised a new 20-mile section of new High Occupancy Toll (HOT) lanes stretching from State Route 163 north to State Route 78 along…


I-238/I-580 and I-880 Interchange

I-238/I-580 and I-880 Interchange - Hayward and San Leandro, CA

Interstate 238 serves as the single east-west freight connector between the San Francisco and Oakland ports and California's agricultural heartland. Flatiron is reconstructing over two miles of I-238 in Alameda County. I-238 is the portion of state Route 238 that connects two…


I-5 Reconstruction at Buena Park

I-5 Reconstruction at Buena Park - Buena Park, CA

Flatiron reconstructed a two-mile portion of Interstate 5 from Orangethorpe to Artesia Avenue in Buena Park, Calif. This project was comprised of six bridge improvements, both widening and complete reconstruction, three miles of retaining walls to accommodate the extended…


I-680 Wetlands Mitigation

I-680 Wetlands Mitigation - Benicia, CA

This project included creating a new drainage channel, retention pond, and associated wetlands to replace those lost during the construction of the State's Benicia-Martinez Bridge. Flatiron delivered this project to the California Department of Transportation a full three…


I-880/Coleman Avenue Interchange

I-880/Coleman Avenue Interchange - San Jose, CA

The I-880/Coleman Avenue Interchange project included the realignment and widening of existing ramps, adding a new direct connector ramp from Airport Boulevard to southbound I-880, replacing the Coleman Avenue overcrossing at I-880, and widening Coleman Avenue to six lanes…


Interstate 25 Managed Lanes

Interstate 25 Managed Lanes - Thornton, CO

Flatiron secured a contract for $42 million for work on Interstate 25 in Colorado. Work includes adding a managed lane on the inside shoulder in each direction along six miles of I-25. This new lane will connect to the existing I-25 Express Lanes to and from downtown Denver. Flatiron…


Interstate 5 Panel Replacement

Interstate 5 Panel Replacement - San Diego, CA

This interstate improvement project involved the rehabilitation of an 8.5-mile portion of Interstate 5. Flatiron rehabilitated approximately 70 lane miles of Interstate 5 through San Diego County in part by replacing damaged Portland Cement Concrete panels. Flatiron removed and replaced…


Interstate 5 Pavement Repair

Interstate 5 Pavement Repair - Burbank, CA

As the California Department of Transportation's largest concrete repair project at the time, this project required the demolition of 32,000 cubic meters of existing base and Portland Cement Concrete lanes and 4,500 cubic meters of bridge approach slabs. Flatiron…


Knightdale Bypass - US 64

Knightdale Bypass - US 64 - Knightdale, NC

North Carolina Constructors, a joint venture lead by Flatiron, constructed 9.6 miles of new six-lane freeway and 23 bridge structures near Raleigh, North Carolina. This project was a success for both Flatiron and the North Carolina Department of Transportation. It was…


Placentia Avenue Grade Separation

Placentia Avenue Grade Separation - Placentia, CA

The Placentia Avenue Grade Separation project, on the border of the cities of Fullerton and Placentia, Calif., included construction of a crossing for the Burlington North Santa Fe rail line over Placentia Avenue.The new two-span precast girder crossing is approximately…


Route 5 Carmenita

Route 5 Carmenita - Los Angeles, CA

Flatiron is completely reconstructing a 1.25-mile section of Interstate 5 in Los Angeles County, Calif., which is part of the overall I-5 Corridor Improvements project for Caltrans. The project involves removal of the existing two-lane Carmenita bridge, construction of…


State Route 92

State Route 92 - Lehi, Utah

State Route 92 is the main east-west corridor for the communities of Alpine, Highland, Cedar Hills and northeast Lehi, Utah as well as the primary access road for American Fork Canyon. This area in northern Utah County is growing at a rapid pace, and thousands of vehicles…


Tampa Airport Interchanges

Tampa Airport Interchanges - Tampa, FL

The SR-60/Memorial Highway project, also referred to as the Tampa Airport Interchanges project, was the first stage of a significant redevelopment of major arteries through the Tampa metropolitan area. Much of the work involved at-grade highway improvements from I-275 to the…


US 183 Interchange

US 183 Interchange - Austin, TX

Flatiron was the consulting manager for the complex arrangement of mainline highway and exit ramp structures, which included more than 3,000 precast segments and high straddle bents over live traffic at the I-35 and US 183 Interchange in Austin, Texas. As the existing…


US 220/NC 68 Connector (Future I-73) and PTI Taxiway Bridge

US 220/NC 68 Connector (Future I-73) and PTI Taxiway Bridge - Greensboro, NC

In April, the NCDOT awarded a $176,550,000 contract to the design-build, joint-venture team of Flatiron and Blythe Development Company. Construction is scheduled to begin in July. The team is constructing a new 9.4-mile, four-lane, future interstate with a…


Yolo Bypass Sediment Removal

Yolo Bypass Sediment Removal - Woodland, CA

Flatiron removed approximately one million cubic yards of sediment from the Yolo Bypass - a managed floodplain for the Sacramento River - to increase the floodplain's capacity. Due to environmental restrictions, all one million yards of sediment were removed during a…