Maryland Route 390

Maryland Route 390
16th Street
Maryland Route 390 highlighted in red
Route information
Maintained by MDSHA
Length:	1.09 mi (1.75 km)
Existed:	1960 – present
Major junctions
South end:	16th Street at the District of Columbia boundary in Silver Spring
	MD 384 in Silver Spring MD 410 in Silver Spring
North end:	MD 97 in Silver Spring
Location
Counties:	Montgomery
Highway system
Maryland highway system Interstate US State Scenic Byways ← MD 388 MD 392 →

Maryland Route 390 (MD 390) is a state highway in the U.S. state of Maryland. The highway runs 1.09 miles (1.75 km) from 16th Street at the District of Columbia boundary north to MD 97 within Silver Spring. MD 390 is a six-lane divided highway continuation of 16th Street into Maryland and serves as a western bypass of downtown Silver Spring. The portion of the highway south of MD 410 was constructed around 1930. MD 390 was extended north to MD 97 as a divided highway in the late 1950s.

MD 390 begins at Blair Portal traffic circle at the boundary between the District of Columbia and Maryland. 16th Street Northwest heads south from the circle toward the White House. The circle also includes junctions with Eastern Avenue, North Portal Drive, and MD 384 (Colesville Road), which leads to U.S. Route 29 in downtown Silver Spring. There is no direct access from southbound MD 390 to MD 384; southbound MD 390 traffic must travel around Blair Portal to access the other state highway. MD 390 heads north from Blair Portal as a six-lane divided highway. North of its intersections with MD 410 (East–West Highway) and Spring Street, the route passes through an S-curve after which the highway crosses over CSX's Metropolitan Subdivision, which carries MARC's Brunswick Line. North of the railroad tracks, the state highway passes through an oblique intersection with Second Street. The two carriageways of MD 390 split to terminate at separate intersections with MD 97 (Georgia Avenue) in the Montgomery Hills neighborhood of Silver Spring. There is no direct access from northbound MD 97 to MD 390.