Dulles Corridor MetroRail Project, Phases I and II

The Dulles Corridor Metrorail Project is a new 23-mile rail line, extending service from the existing Orange Line at the East Falls Church Station in Arlington County to Route 722/Ryan Road in Loudoun County. Construction of Phase 1 was completed in July 2014 from the Dulles Connector Road/I-66 interchange west to Wiehle Avenue in Reston. Work consisted of building piers and caissons, station foundations and significant traffic pattern changes on Routes 7 and 123. The relocation of 21 existing utilities is almost finished.

Construction of Phase II is underway which will include six stations from Wiehle Avenue in Reston to Ashburn Virginia. A majority of the work will focus in and around the Dulles Airport with over 200 piers being constructed to support the aerial guideway.

NXL is currently providing the Lead Field Construction Structures Specialist for Phase II, and has already provided these services for Phase I. This individual represents the owner (MWAA) for all aerial work including footings, columns, pier caps and segmental bridge precast and erection. Daily oversight inspections include the production, transportation and erection of precast segments, all post-tensioning field work including installation, stressing and grouting, substructure installation and utility relocations.

Other responsibilities include: Shop drawing reviews, IRR reviews, Deficiency Report reviews, specification reviews, change order reviews, accelerated work documentation, weekly production reports for segment production and erection. NXL is providing the Construction administrator for MWAA, who reports to both Jacobs and MWAA. Work includes special projects, cost analysis, documentation and research.

Construction Management

Completion Date

Phase I - 2014 / Phase II - Ongoing


Metropolitan Washington Airport Authority


Jacobs Engineering Group


Northern Virginia

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