Project Details

JV Partner
$220 million
January 2017
Start Date
March 2022
Completion Date

Building North Coast

In a joint venture, Flatiron was awarded part of Phase 1 of the North Coast Corridor project, which includes two segments: Segment 1, Interstate 5 widening and improvements at San Elijo Lagoon; and Segment 6, San Elijo Lagoon Double Track Rail. The project, which is located in coastal northern San Diego County, was awarded as a result of successful pre-construction services and negotiation of the first two segments. 

Overall, the work represents a significant piece of a $6.5 billion plan, dubbed the North Coast Corridor Program (NCC), which involves numerous rail and highway improvements stretching between the cities of La Jolla and Oceanside. Interstate 5 is a major north-south artery serving the San Diego metropolitan area and numerous surrounding cities.

Flatiron’s Phase 1 work (Segment 1) involves improvements along 14 miles of the interstate, including construction of two high occupancy vehicle (HOV) lanes, as well as 4.2 miles of rail. Flatiron will also be responsible for I-5 improvements at San Elijo Lagoon, which includes replacing the current eight-lane bridge that crosses over the lagoon with a larger, wider span that will accommodate one-additional carpool lane in each direction.

The project (Segment 6) also entails replacing a more than 60-year-old wooden, single track trestle rail bridge with a modern, double-track concrete bridge, as part of a major rail improvement initiative between the cities of Encinitas and Solana Beach. The double-track bridge will allow trains traveling in opposite directions to pass freely without stopping since it will connect continuous double track along the LOSSAN coastal rail corridor.

San Elijo Lagoon is home to numerous endangered species, is a wildlife and recreation area, and is one of the largest coastal wetlands in San Diego County. Special care and considerations will be implemented to minimize or eliminate impact, protect endangered species and their habitat, while maintaining a safe and secure worksite.

Caltrans pilot program for Construction Manager-General Contractor (CM/GC) procurement process

Largest of five pilot projects statewide and only project to combine 8 different “jobs” into one project

Construction of rail and highway bridges for Interstate 5 and associated improvements in, around, and over the environmentally sensitive San Elijo Lagoon