U.S. Route 1 in the District of Columbia

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U.S. Route 1 marker

U.S. Route 1
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 Washington
US 29 in Washington
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&nbps;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 11 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 Mile[2] km Destinations Notes
Potomac River 0.00 0.00 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 0.50 0.80 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
0.70 1.13 I-395 south (Rochambeau Memorial Bridge) To HOV 3+ only; Southbound exit and northbound entrance
Washington Channel 0.80 1.29 14th Street Bridges (US 1 span)
Washington 0.90 1.45 Maine Avenue SW Interchange; No southbound exit
1.20 1.93 Independence Avenue SW No left turns except from US 1 south to Independence Avenue east
1.50 2.41 US 50 west (Constitution Avenue NW) / 14th Street NW north Southern terminus of concurrency with US 50, No left turns
1.70 2.74 12th Street Expressway / 12th Street NW north Northern terminus of 12th Street Expressway (one-way northbound)
2.00 3.22 I-395.svg 9th Street Expressway south to I-395 Northern terminus of 9th Street Expressway (one-way southbound)
Southern terminus of one-way pairs (6th Street NW north / 9th Street NW south)
2.10 3.38 Constitution Avenue NW east
2.20 3.54
US 1 Alt. north (Pennsylvania Avenue NW)
Southern terminus of US 1 Alternate; Access from US 1 north only
2.80 4.51 Massachusetts Avenue NW To Union Station
3.00 4.83 US 50 east (New York Avenue NW) to I-495 Northern terminus of concurrency with US 50
3.10 4.99 US 1 south / US 50 west (L Street NW) Northern terminus of one-way pairs
3.60 5.79 US 29 (Rhode Island Avenue NW west / 6th Street NW north)
3.80 6.12 Florida Avenue NW
4.20 6.76 North Capitol Street
7.00 11.27 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.


U.S. Route 1
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