U.S. Route 1 in the District of Columbia

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This article is about the section of U.S. Route 1 in the District of Columbia. For the entire route, see U.S. Route 1.

U.S. Route 1 marker

U.S. Route 1
Map of the District of Columbia with US 1 highlighted in red
Route information
Maintained by DDOT
Length: 7 mi[1][2] (11 km)
Existed: 1926 – present
Major junctions
South end: US 1 / I‑395 in Arlington, VA
  I‑395 in East Potomac Park
US 50 in Downtown Washington
US 29 in Shaw
North end: US 1 / Eastern Ave in Mt. Rainier, MD
Highway system
I‑695 US 29

With the District of Columbia, U.S. Route 1 passes between Arlington, Virginia and Mount Rainier, Maryland predominantly along surface streets. However, it forms a few overlaps with other routes.

Route description[edit]

Northbound US 1 and Interstate 395 enter the District of Columbia from Virginia on the 14th Street Bridge. US 1 traffic exits Route 395 from the left to 14th Street, S.W. After 14th Street crosses the National Mall, US 1 turns right onto Constitution Avenue. It then turns left onto 6th Street, N.W., and then right onto Rhode Island Avenue. US 1 continues on Rhode Island Avenue through Northeast Washington and into Maryland.

Southbound US 1 enters the District of Columbia from Maryland on Rhode Island Avenue. US 1 turns left onto 6th Street, N.W., then right onto L Street, N.W., and then left onto 9th Street, N.W. It enters the Ninth Street Tunnel and joins Interstate 395, which it follows into Virginia.

Northbound US 1 is concurrent with eastbound U.S. Route 50 along Constitution Avenue from 14th Street to 6th Street, N.W., and along 6th Street from Constitution Avenue to New York Avenue, N.W. Southbound US 1 is concurrent with westbound US 50 along L Street between 6th and 9th streets, N.W., and along 9th Street from L Street to Constitution Avenue. Both northbound and southbound US 1 have concurrencies with Interstate 395.


When originally designated in 1926, US 1 entered Washington on Bladensburg Road. The old route then continued on Maryland Avenue and turned south on 1st Street, where it then turns left into the U.S. Capitol grounds. US 1 went around the Capitol making its way to Pennsylvania Avenue. The route continues on Pennsylvania Avenue to 14th Street where it turns south. US 1 then left Washington on 14th Street as it does today. By 1946, US 1 entered from the north using Rhode Island Avenue continuing all the way to 14th Street (via Vermont Avenue). It was shifted to its current alignment by 1967.

Major intersections[edit]

The entire route is in the District of Columbia.

Location mi[2] km Destinations Notes
Potomac River 0.0 0.0 I‑395 south / US 1 south – Richmond, Alexandria Continuation into Virginia
14th Street Bridges (Arland D. WIlliams Jr. Memorial Bridge / George Mason Memorial Bridge)
East Potomac Park 0.5 0.8 I‑395 north – Capitol Hill, Verizon Center, Nationals Park Northern terminus of concurrency with I-395; Exit 1 on I-395; Northbound exit and southbound entrance
0.7 1.1 I‑395 south (Rochambeau Memorial Bridge) To HOV 3+ only; Southbound exit and northbound entrance
Washington Channel 0.8 1.3 14th Street Bridges (US 1 span)
Southwest Federal Center 0.9 1.4 Maine Avenue SW Interchange; No southbound exit
National Mall–Downtown 1.5 2.4 US 50 west (Constitution Avenue NW) / 14th Street NW north Southern terminus of concurrency with US 50, No left turns
1.7 2.7 12th Street Expressway / 12th Street NW north Northern terminus of 12th Street Expressway (one-way northbound)
2.0 3.2 I-395.svg 9th Street Expressway south to I-395
US 1 north / US 50 east
Northern terminus of 9th Street Expressway (one-way southbound)
Southern terminus of one-way pairs (6th Street NW north / 9th Street NW south)
Downtown 2.2 3.5
US 1 Alt. north (Pennsylvania Avenue NW)
Southern terminus of US 1 Alternate; Access from US 1 north only
Mount Vernon Square 3.0 4.8 US 50 east (New York Avenue NW) to I‑495 Northern terminus of concurrency with US 50
3.1 5.0 US 1 south / US 50 west (L Street NW) Northern terminus of one-way pairs
Shaw 3.6 5.8 US 29 (Rhode Island Avenue NW west / 6th Street NW north)
Woodridge 7.0 11.3 US 1 north (Rhode Island Avenue) / Eastern Avenue NE – Baltimore Continuation into Maryland
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Related routes[edit]

U.S. Route 1 Alternate
Location: Washington, D.C.Hyattsville, MD
Length: 2.1 mi (3.4 km)

U.S. Route 1 Alternate leaves U.S. Route 1 at the corner of 6th Street NW and Pennsylvania Avenue NW and rejoins the highway in Hyattsville, Maryland.


  1. ^ American Association of State Highway and Transportation Officials, United States Numbered Highways, 1989 Edition
  2. ^ a b Google (January 2, 2014). "US 1" (Map). Google Maps. Google. Retrieved January 2, 2014. 

External links[edit]

Route map: Bing / Google

U.S. Route 1
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