Cabin John Parkway

Cabin John Parkway is an automobile parkway in the US state of Maryland. The parkway runs 1.50 miles (2.41 km) from Clara Barton Parkway in Cabin John north to Interstate 495 (I-495) in Bethesda in southwestern Montgomery County. Cabin John Parkway is a four-lane freeway that serves as a connector between Clara Barton Parkway in the direction of Washington, D.C. and I-495 in the direction of Rockville and Silver Spring. The parkway was constructed in the mid-1960s and passes under the historic Union Arch Bridge, the longest masonry arch span in America.

Cabin John Parkway

Cabin John Parkway highlighted in red
Route information
Maintained by MDSHA
Length1.50 mi[1] (2.41 km)
Existed1965–present
RestrictionsNo trucks
Major junctions
South endClara Barton Parkway in Cabin John
North end I-495 in Bethesda
Location
CountryUnited States
StateMaryland
CountiesMontgomery
Highway system

Route description
View south at the north end of the Cabin John Parkway

Cabin John Parkway begins at a partial interchange with Clara Barton Parkway in the unincorporated area of Cabin John. The interchange allows access from southbound Cabin John Parkway to eastbound Clara Barton Parkway and from westbound Clara Barton Parkway to northbound Cabin John Parkway. Each direction of the parkway crosses Cabin John Creek before the roadways come together to pass under the Union Arch Bridge, which carries the Washington Aqueduct and MacArthur Boulevard. Cabin John Parkway crosses Cabin John Creek again before continuing north as a four-lane freeway with a speed limit of 55 mph (89 km/h) through a forested corridor paralleling the creek. After crossing Booze Creek, the two directions of the parkway divide toward their terminuses at I-495 (Capital Beltway) in Bethesda. The northbound direction of the Cabin John Parkway splits into single-lane ramps for northbound I-495 and I-495's interchange with Maryland Route 190 (MD 190; River Road). The southbound parkway is formed by ramps from southbound I-495 and MD 190.[1][2]

Cabin John Parkway is maintained by the Maryland State Highway Administration and has an internal designation of Interstate 495X (I-495X). Trucks are prohibited on the parkway.[1] Cabin John Parkway is a part of the National Highway System as a principal arterial for its entire length.[1][3]

History
View north along Cabin John Parkway near the Clara Barton Parkway

Construction on Cabin John Parkway began in 1962 when I-495's bridge across Cabin John Creek and the southbound ramp to the parkway was built.[4] Work on the remainder of the parkway was underway by 1963.[5] Cabin John Parkway opened in 1965 when the Clara Barton Parkway (then known as the Maryland portion of the George Washington Parkway) from the Cabin John interchange east to the MacArthur Boulevard interchange opened.[6]

Exit list

The entire parkway is in Montgomery County. All exits are unnumbered.

Locationmi[1]kmDestinationsNotes
Cabin John0.000.00Clara Barton Parkway east – Glen Echo, WashingtonOne-way peak-direction road during rush hours
Bethesda1.282.06 MD 190 (River Road) – Potomac, WashingtonNorthbound exit and southbound entrance; other movements via I-495 exit 39
1.502.41
 I-495 north (Capital Beltway) – Silver Spring		Exit 40 on I-495
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

References
  1. Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved September 8, 2013.
  2. National Highway System: Washington, DC-VA-MD (PDF) (Map). Federal Highway Administration. October 1, 2012. Retrieved May 16, 2015.
  3. Google (May 19, 2010). "Cabin John Parkway" (Map). Google Maps. Google. Retrieved May 19, 2010.
  4. Federal Highway Administration (2012). "NBI Structure Number: 100000150108010". National Bridge Inventory. Federal Highway Administration.
  5. Maryland State Roads Commission (1963). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Roads Commission.
  6. Maryland State Roads Commission (1965). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Roads Commission.
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