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Maryland Route 100
MD 100 is a major expressway in the southern suburbs of Baltimore, acting as a partial outer beltway. It runs from US 29 between Columbia and Ellicott City to MD 177 approaching Gibson Island. MD 100 was constructed piecemeal over a 30 year period, originally opening from then MD 3 (now I-97) to Mountain Road near MD 2 (Ritchie Hwy). By 1970, the entire section from MD 3 to MD 177 near Gibson Island was either under construction or opened. Another small section from I-95 to US 1 was opened around the mid-1970s, with the biggest sections of MD 100 being built between 1989 and 1998. MD 100 was officially completed and opened in full in late 1998.
