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Coming Soon

Route 1/123 Interchange

Widening Jefferson Davis Highway and Gordon Boulevard, Undergrounding Utilities; Interchange (Prince William County)

Area Maps

Project at a Glance

Begin Date
2015 - Utilities Ductbank Construction
2016 – Phase 1: Route 1 Widening
TBD – Phase 2: Route 1/123 Interchange

$259 million

Prince William

Northern Virginia

Calvin Britt, P.E.
Project Manager
Claudia Llana, P.E.
Preliminary Engineering Manager for Prince William County
Chan Basnayake, P.E.
Area Construction Engineer
Mark Comer
Utilities Relocations

About the Project

The intersections along Route 1 at Route 123 and Occoquan Road operate at capacity during peak periods, and are expected to operate at unacceptable levels in the future without the planned improvements. This project will widen both Routes 1 and 123 in Phase 1, build Route 123 over Route 1 and the CSXT railroad in Phase 2, and make several other intersection improvements to significantly improve traffic flow. 

In Phase 1, Route 1 will be widened from four to six lanes between Mary's Way and the Occoquan River. Route 123 will also be widened from four to six lanes from the Route 1 interchange to just east of the I-95 interchange. 

The proposed project also provides enhanced access to the Woodbridge VRE/Amtrak Station for vehicles, bikes and pedestrians during the project's first phase. It also constructs an important segment of the Potomac Heritage National Scenic Trail from the intersection at Route 123 and Annapolis Way to the Belmont Bay community.

In advance of this phase and beginning in early 2015, an underground Ductbank for utilities along Route 1 will be constructed and buildings in the path of the Ductbank will be cleared and demolished.

In Phase 2, the new interchange will build Route 123 over Route 1 to separate through traffic, and connect Route 123 to Belmont Bay Drive east of the railroad. Express Drive will also be raised to connect to the new Route 123/Belmont Bay Drive. The project will eliminate two signalized intersections on Route 1 at Route 123 and Annapolis Way. The signal at Route 1 and Occoquan Road will remain and traffic operations will be improved by adding additional through and turn lanes on both roads.

These improvements will allow Routes 1 and 123 to operate at acceptable service levels through 2036.

Route 1 currently carries approximately 35,000 vehicles per day and Route 123 carries about 21,000 vehicles per day. Projected volumes for 2036 are 75,000 vehicles per day on Route 1 and 36,000 on Route 123.

Project Features

Some of the project's features include: 

  • Raised grass medians on Route 1 between Mary’s Way and the Occoquan River, and on Route 123 over Route 1 to Belmont Bay Drive
  • A new Route 1 bridge at Marumsco Creek
  • A ten-foot shared-use path and a six-foot sidewalk on both Routes 1 and Route 123 
  • Utilities along the Route 1 corridor will be placed underground.

Route 1 intersection at Occoquan Road/Dawson Beach Road will be improved by:

  • Additional thru lanes on Route 1
  • Double left turn lanes on northbound Route 1 to Occoquan Road
  • Eliminating southbound Route 1 left turns to Dawson Beach Road
  • Additional turn lanes on Occoquan Road
  • Limiting westbound Dawson Beach Road to right-turn only onto northbound Route 1

Typical Section

Project Schedule

2011 - Public hearing held
2012 - Began right-of-way acquisition
2015 – Begin construction of underground Utilities Ductbank
2016 – 2018 - Phase 1 road construction: widen Route 1 and Route 123
TBD  - Phase 2 road construction – Route 1/123 Interchange  (schedule to be determined, pending funding)

VDOT’s current plans are to build the project in phases.  In preparation for the road construction, right of way has been acquired, and demolition of buildings in the path of the future road improvements has started. Construction of an underground Utilities Ductbank is scheduled to start in early 2015. Phase 1 road construction would widen Route 1 and make improvements to Occoquan Road, with construction anticipated to start in early 2016. The remaining Route 123 improvements and proposed interchange (Phase 2) would be constructed when additional funding has been identified.

Estimated Costs

Preliminary Engineering: $14.6 million
Right of Way: $86.6 million
Ductbank: up to $12.1 million (design/adjustments/construction)  
Roadway Construction: $145.7 million
Total: $259 million


Construction Plans for Road Construction Phase 1 (6MB)
Interchange Design Alternative A Phase 2 - Dawson Beach Road full access at Route 1
Interchange Design Alternative B Phase 2 - Dawson Beach Road partial access at Route 1 (preferred) (6MB)
Typical Section Renderings
Public Hearing Brochure (March 2011)
Public Hearing Comments and Resolution

Prince William Board of County Supervisors Resolution for Undergrounding Utilities (Dec. 2013)


Environmental documents:
Environmental Assessment
Environmental Assessment Reevaluation
Finding of de minimus impact

UPCs: 14693, 105798, 94102, 100938
State Projects: 0123-076-F29, 0001-076-171, 0123-076-004, 0123-076-080
Federal Project: STP-111-1(114)

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Page last modified: Oct. 17, 2014