Cabin John Parkway is an automobile parkway

Parkway

The term parkway has several distinct principal meanings and numerous synonyms around the world, for either a type of landscaped area or a type of road.Type of landscaped area:...

 in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

. The parkway runs 1.5 mi (2.4 km) from Clara Barton Parkway in Cabin John

Cabin John, Maryland

Cabin John is a census-designated place and an unincorporated area in Montgomery County, Maryland, United States. The placename is a corruption of its original name of "Captain John's Mills."-Geography:...

 north to the Capital Beltway

Interstate 495 (Capital Beltway)

Interstate 495 is a Interstate Highway that surrounds the United States' capital of Washington, D.C., and its inner suburbs in adjacent Maryland and Virginia. I-495 is widely known as the Capital Beltway or simply the Beltway, especially when the context of Washington, D.C., is clear...

 (Interstate 495) in Bethesda

Bethesda, Maryland

Bethesda is a census designated place in southern Montgomery County, Maryland, United States, just northwest of Washington, D.C. It takes its name from a local church, the Bethesda Meeting House , which in turn took its name from Jerusalem's Pool of Bethesda...

. Cabin John Parkway, which has an unsigned

Unsigned highway

An unsigned highway is a highway that has been assigned a route number, but does not bear conventional road markings that would normally be used to identify the route with that number...

 designation of I-495X, is maintained by the Maryland State Highway Administration

Maryland State Highway Administration

The Maryland State Highway Administration is the state agency responsible for maintaining Maryland numbered highways outside of Baltimore City...

 and is closed to trucks.

Route description

Cabin John Parkway begins at a partial interchange with Clara Barton Parkway in Cabin John that allows access to and from the direction of Washington. Each direction of the parkway crosses Cabin John Creek

Cabin John Creek (Potomac River)

Cabin John Creek is a tributary stream of the Potomac River in Montgomery County, Maryland. The watershed covers an area of . The headwaters of the creek originate in the city of Rockville, and the creek flows southward for to the Potomac River....

 before the roadways come together to pass under the Union Arch Bridge

Union Arch Bridge

The Union Arch Bridge, also called the "Cabin John Bridge," is a historic masonry structure in Cabin John, Maryland. It was designed as part of the Washington Aqueduct and as a roadway bridge. The bridge construction began in 1857 and was completed in 1864. The roadway surface was added later...

, which carries both the Washington Aqueduct

Washington Aqueduct

The Washington Aqueduct is an aqueduct that provides the public water supply system serving Washington, D.C., and parts of its suburbs. One of the first major aqueduct projects in the United States, the Aqueduct was commissioned by Congress in 1852, and construction began in 1853 under the...

 and MacArthur Boulevard. Cabin John Parkway crosses Cabin John Creek again before heading north as a four-lane freeway with a speed limit of 55 mph (88.5 km/h) through a forested corridor paralleling the creek. After crossing Booze Creek, the two directions of the parkway divide toward their termini. The northbound direction of the Cabin John Parkway splits into two ramps: one for I-495's interchange with Maryland Route 190

Maryland Route 190

Maryland Route 190, or River Road, is a major state highway through southern Montgomery County, Maryland, United States.-Route description:MD 190 begins at MD 112's western terminus in Seneca, and ends at the Montgomery County/Washington, D.C. border...

 (River Road) and another ramp to the inner loop or northbound direction of I-495 (Capital Beltway).

Junction list

The entire route is in Montgomery County

Montgomery County, Maryland

Montgomery County is a county in the U.S. state of Maryland, situated just to the north of Washington, D.C., and southwest of the city of Baltimore. It is one of the most affluent counties in the United States, and has the highest percentage of residents over 25 years of age who hold post-graduate...

.

Location	Mile	Destinations	Notes
Cabin John Cabin John, Maryland Cabin John is a census-designated place and an unincorporated area in Montgomery County, Maryland, United States. The placename is a corruption of its original name of "Captain John's Mills."-Geography:...	0.00	Clara Barton Parkway east – Glen Echo Glen Echo, Maryland Glen Echo is a town in Montgomery County, Maryland, United States, that was chartered in 1904. The population was 242 at the 2000 census.Glen Echo derives its name from Edward and Edwin Baltzley, who came up with name circa 1888... , Washington Washington, D.C. Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....	Southern terminus; westbound exit and eastbound entrance from Clara Barton Parkway
Bethesda Bethesda, Maryland Bethesda is a census designated place in southern Montgomery County, Maryland, United States, just northwest of Washington, D.C. It takes its name from a local church, the Bethesda Meeting House , which in turn took its name from Jerusalem's Pool of Bethesda...	1.28	, Washington Washington, D.C. Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....	Northbound exit and southbound entrance
	1.50		Northern terminus; southbound exit and northbound entrance from I-495

External links

• I-495 @ MDRoads.com (includes I-495X)