U.S. Route 50 in the District of Columbia
|Maintained by DDOT|
|Length:||9.00 mi (14.48 km)|
|West end:||I-66 / US 50 on the Virginia state line near Rosslyn, VA|
| I-66 in Washington
US 1 in Washington
I-395 in Washington
|East end:||US 50 on the Maryland state line near Cheverly, MD|
U.S. Route 50 (US 50) is a major east–west route of the U.S. Highway system, stretching just over 3,000 miles (4,800 km) from Ocean City, Maryland, on the Atlantic Ocean, to West Sacramento, California, nearly to the Pacific Ocean. In the District of Columbia, US 50 passes between Arlington County, Virginia, and Prince George's County, Maryland, predominantly along surface streets, including a part of Constitution Avenue along the National Mall.
Route description 
U.S. Route 50 and Interstate 66 enter the District of Columbia from Arlington, Virginia on the Theodore Roosevelt Bridge over the Potomac River. US 50 traffic exits I-66 to Constitution Avenue, N.W., along the north side of the National Mall, passing the Lincoln Memorial, the Vietnam Veterans Memorial, the White House, the World War II Memorial, and the Washington Monument, then traveling between Federal Triangle's office buildings on the north and the Smithsonian Institution's National Museum of American History, National Museum of Natural History, and a National Gallery of Art sculpture garden to its south.
Near the National Art Gallery, Route 50 turns left onto 6th Street, N.W., and after several blocks, right onto New York Avenue, N.W. The route continues northeast on New York Avenue through Northeast Washington, passing the United States National Arboretum. Beyond the Arboretum, New York Avenue becomes a freeway, with an off-level interchange with South Dakota Avenue, N.E. in the Fort Lincoln area. US 50 then crosses the Anacostia River and continues into Maryland, where it becomes the John Hanson Highway and soon has an interchange with the Baltimore-Washington Parkway.
US Route 50 enters the District of Columbia from Maryland on the John Hanson Highway, which, as noted above, eventually becomes New York Avenue, N.E. The westbound route then follows New York Avenue into Northwest Washington, then turns right onto L Street, N.W., left onto 9th Street, N.W., and right onto Constitution Avenue, N.W. After passing the National Mall, it then joins Interstate 66, which it follows across the Potomac River into Virginia on the Theodore Roosevelt Bridge.
Northbound U.S. Route 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 U.S. Route 1 is concurrent with westbound U.S. Route 50 along L Street between 6th and 9th streets, N.W., and along 9th Street from L Street to Constitution Avenue. Interstate 66 and U.S. Route 50 are concurrent on the Theodore Roosevelt Bridge. U.S. Route 1 Alternate is concurrent with Route 50 along New York Avenue between 6th Street, N.W., and Bladensburg Road, N.E.
Interstate 395 junction 
The northern terminus of Interstate 395 is at a signaled intersection with New York Avenue and 4th Street, N.W. At that intersection, traffic from New York Avenue in either direction may turn south onto Interstate 395, but traffic on northbound Interstate 395 may turn only right (east) onto New York Avenue, but not west toward downtown Washington.
The New York Avenue Industrial Freeway, if built, would have replaced New York Avenue as U.S. Route 50 east of Interstate 395.
|This section requires expansion. (April 2013)|
Major intersections 
||This section contains a table that is missing mileposts for one or more junctions. Please help by|
The entire route is in the District of Columbia.
|Potomac River||0.00||0.00||Theodore Roosevelt Bridge
I-66 west / US 50 west to GW Parkway
District of Columbia–Virginia border
|Washington||I-66 east / E Street Expressway||Interchange; Eastbound exit and westbound entrance; Eastern terminus of concurrency with I-66; I-66 Exit 2|
|Independence Avenue SW||nterchange; Eastbound exit and westbound entrance|
|1.00||1.61||23rd Street NW||Eastern terminus of freeway section|
|2.00||3.22||US 1 south (14th Street NW) to I-395 south||Western terminus of concurrency with US 1|
|12th Street Expressway||Northern terminus of the 12th Street Expressway (one-way northbound)|
|4.00||6.44||9th Street Expressway south to I-395 / 9th Street NW north||Northern terminus of the 9th Street Expressway (one-way southbound)
Southern terminus of one-way pairs (6th Street NW north / 9th Street NW south)
|Constitution Avenue NW east|
US 1 Alt. north (Pennsylvania Avenue NW)
|Southern terminus of US 1 Alternate; No access from US 1 south|
|US 1 north (6th Street NW) / New York Avenue NW west||Eastern terminus of concurrency with US 1; US 50 west connects to 9th Street via L Street|
|I-395 south (3rd Street Tunnel)||Northern terminus of I-395|
|North Capitol Street|
|9th Street NE||Interchange; No entrances to US 50 west|
US 1 Alt. north (Bladensburg Road NE) to US 1 – Bladensburg, MD
|Western terminus of freeway section|
|36th Place NE||Interchange; Eastbound exit and entrance|
|South Dakota Avenue NE / Fort Lincoln Drive NE||Interchange; No access from southbound South Dakota Avenue to westbound US 50; No access to Fort Lincoln Drive from US 50 east|
|DC–MD border||9.00||14.48|| US 50 east (John Hanson Highway) to I-495 / Balt-Wash Parkway
District of Columbia–Maryland border
- District of Columbia Highway(s), from Yurasko.net
- Washington D.C. Interstates and Freeways, from Roads to the Future
|U.S. Route 50|
|District of Columbia||Next state: