Virginia State Route 123
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| Route information | ||||
| Maintained by VDOT | ||||
| Length: | 29.27 mi (47.11 km) | |||
| Existed: | 1940 – present | |||
| Major junctions | ||||
| South end: |
 US 1 in Woodbridge
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| North end: | Chain Bridge in Arlington | |||
| Location | ||||
| Counties: | Prince William, Fairfax, City of Fairfax, Arlington | |||
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State Route 123 (SR 123) is a primary state highway in the U.S. state of Virginia. The state highway runs 29.27 miles (47.11 km) from U.S. Route 1 (US 1) in Woodbridge north to the Chain Bridge across the Potomac River into Washington from Arlington. It goes by three local names. From its southern terminus to the Occoquan River Bridge, it is known as Gordon Boulevard. From the Occoquan River Bridge to the city of Fairfax it is known as Ox Road. North from Fairfax, it is known as Chain Bridge Road. SR 123 is a partial circumferential highway in Northern Virginia that connects Woodbridge in eastern Prince William County with the independent city of Fairfax and the Fairfax County communities of Vienna, Tysons Corner, and McLean, the last the home of the National Counterterrorism Center and the Central Intelligence Agency. The state highway also connects all of the major highways that radiate from Washington, including Interstate 95, I-66, US 29, US 50, SR 267, and the George Washington Memorial Parkway. Furthermore, SR 123 crosses another pair of circumferential highways, I-495 and the Fairfax County Parkway, and SR 7, a major northwest–southeast highway through Northern Virginia. The state highway is a part of the National Highway System for its entire length.
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