Maryland Route 190

Maryland Route 190
River Road
Maryland Route 190 highlighted in red
Route information
Maintained by MDSHA
Length	15.88 mi[1] (25.56 km)
Existed	1927–present
Tourist routes	Chesapeake and Ohio Canal Scenic Byway
Major junctions
West end	MD 112 near Seneca
Major intersections	MD 189 in Potomac MD 191 in Potomac I-495 / Cabin John Parkway near Bethesda MD 188 in Bethesda MD 614 in Bethesda
East end	Western Avenue NW at the District of Columbia boundary in Bethesda
Location
Country	United States
State	Maryland
Highway system
Maryland highway system Interstate US State Scenic Byways
← MD 189 → MD 191

Maryland Route 190 (MD 190) is a state highway in the U.S. state of Maryland. Known as River Road, the highway runs 15.88 miles (25.56 km) from MD 112 near Seneca east to Western Avenue at the District of Columbia boundary in Bethesda. MD 190 parallels the Potomac River through the affluent southwestern Montgomery County communities of Potomac and Bethesda and connects those suburbs with Interstate 495 (I-495). River Road was paved from Washington, D.C. west through part of Bethesda in the early 1910s. A second section of MD 190 was constructed through Potomac in the mid-1920s. The Bethesda and Potomac portions of the route were unified in the late 1920s. MD 190 was extended west toward Seneca in two steps in 1950 and the early 1970s. The highway was expanded to a four-lane divided highway through Bethesda in the early 1960s.

The westernmost 8.14 miles (13.10 km) of MD 190 are signed concurrently with the Chesapeake and Ohio Canal Scenic Byway, a state tourist route.^[2]