State Route 123 (Virginia)

State Route 123 (Virginia) is a primary state highway in Northern Virginia, connecting the suburban and commercial corridors of Prince William County and Fairfax County. The route serves as a vital commuter artery, linking major employment centers like Tysons with residential communities and military installations to the south. It traverses significant historical areas and passes near landmarks such as George Mason University and the Marine Corps Base Quantico.

Route description

State Route 123 begins at an intersection with U.S. Route 1 in the community of Triangle, just east of the main gate of Marine Corps Base Quantico. From there, it heads north through Prince William County, passing the Prince William Forest Park and the National Museum of the Marine Corps. The road crosses into Fairfax County near the town of Occoquan, where it briefly runs concurrently with State Route 611. It continues north through Fairfax County, serving the city of Fairfax and the campus of George Mason University. The route passes through the City of Fairfax independent city before entering the dense commercial district of Tysons, where it terminates at an intersection with State Route 7 near the Tysons Corner Center mall.

History

The origins of State Route 123 lie in early 20th-century auto trails, with its alignment following portions of the historic Richmond-Washington Post Road. It was designated as part of the state highway system in the 1920s, initially running from Triangle to Fairfax. A significant extension in the 1960s pushed the northern terminus to Tysons to accommodate the region's rapid suburban growth following the construction of the Capital Beltway. The route's path through Fairfax was realigned in the late 20th century to bypass the city's historic downtown, utilizing a new bypass road. Throughout its history, it has been upgraded to a multi-lane divided highway along most of its length to handle increasing traffic volumes from developments around Marine Corps Base Quantico, Fort Belvoir, and the Tysons urban core.

Major intersections

From south to north, key junctions include the southern terminus at U.S. Route 1 in Triangle. It intersects State Route 619 (Joplin Road) near Prince William Forest Park and meets Interstate 95 at a partial interchange. In Occoquan, it runs concurrently with State Route 611 and crosses the Occoquan River. Farther north, it intersects the Capital Beltway (Interstate 495) via a full cloverleaf interchange. In the City of Fairfax, it meets U.S. Route 50 and State Route 236 (Main Street). The northern terminus is at State Route 7 (Leesburg Pike) in Tysons, just west of Tysons Corner Center.

Special designations

A portion of State Route 123 is designated as the **General James M. Rockwell Memorial Highway**, honoring the former commander of the United States Air Force's Air Defense Command. The segment passing through the historic area of Occoquan is also part of the **Virginia Byways** scenic road system. Furthermore, the road is officially listed as a **Primary State Highway** in the state system, denoting its importance for through traffic and economic activity. It is a key evacuation route for Marine Corps Base Quantico and Fort Belvoir as designated by the Virginia Department of Emergency Management.

Related routes

State Route 123 has one related business route, **State Route 123 Business**, which follows the original alignment through downtown Fairfax along Chain Bridge Road and Main Street. The route also has indirect connections to several other significant highways, including State Route 286 (the Fairfax County Parkway), which it intersects, and State Route 620 (Braddock Road). Its northern terminus at State Route 7 provides a direct link to the Dulles Access Road and Washington Dulles International Airport.

Category:State highways in Virginia