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Tier 1 Environmental Impact Statement

In summer 2011, VDOT and DRPT, in partnership with the Federal Highway Administration (FHWA), began work on a Tier 1 Final Environmental Impact Statement (EIS) to define existing and future transportation conditions and needs within the 25-mile I-66 Corridor from Route 15 in Haymarket to I-495. This study identified a range of conceptual-level improvements that would address those needs, and evaluated the potential effects of these concepts on the natural and human environments. A Tier 1 EIS differs from a traditional EIS in that it focuses on broad issues, such as purpose and need, travel modes (bus, carpool, rail transit, car, etc.), technology choices, and the general locations of proposed improvements.

In November 2013, FHWA approved the EIS with a Record of Decision. As detailed in this document, during the Tier 1 process, VDOT and DRPT identified the following:  

  • Ten concepts that will increase capacity, provide multimodal options, improve individual interchanges, and address safety and operations.
  • Locations of each improvement concept will be located within the I-66 Corridor from Route 15 in Haymarket to I-495, rather than in new location corridors.
  • Improvement concepts will need to be prioritized based on viability and feasibility, with recommendations on what improvements should move forward.
  • Tolling may be advanced for subsequent study in the next phase of environmental analysis.