Maryland Route 200 - History - Washington Outer Beltway

Washington Outer Beltway

The ICC can be traced to plans developed in the 1950s for an Outer Beltway. The original Outer Beltway had been planned to pass south of the corporate limits of Rockville. Plans for most of the ICC alignment under construction in 2009 (between I-370 and the Trolley Museum site) were developed in the 1960s, and ran to the north and west of the original alignment. Even though the ICC does not cross the Potomac River, the new route was motivated in part by a desire to re-route an Outer Beltway crossing of the Potomac River upstream from the area of River Bend to Watkins Island.

In 1975, the the National Capital Region Transportation Planning Board (TPB) of the Metropolitan Washington Council of Governments endorsed a request from the State Highway Administration "for federal support of a $1.1 million planning and engineering study of the first 8-mile segment of the road" (then called the Outer Beltway), which was to "run from the Baltimore-Washington Parkway near Beltsville westward to a point near Interstate Rte 70S at Gaithersburg." However, the current route of the ICC follows that alignment only from a point near the site of the National Capital Trolley Museum east to US 1 (Baltimore Avenue) in Beltsville.

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